Bulimia Nervosa

Psychiatric MONDO:0005452 Pathograph 45 Show in embeddings browser Eating Disorder Mental Health Disorder

Bulimia nervosa is an eating disorder characterized by recurrent loss-of-control binge eating, recurrent inappropriate compensatory behaviors intended to prevent weight gain, and excessive influence of body shape or weight on self-evaluation. Compensation can involve vomiting, laxative or diuretic misuse, fasting, or excessive exercise. People often have normal or higher body weight; serious purging-related complications can occur without an underweight appearance. Liability is multifactorial, and psychological treatment is central to care.

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Discussions and Knowledge Gaps

Which neural or molecular findings precede and sustain BN?

KNOWLEDGE GAP bn-neural-cause-and-consequence

Attached to

pathophysiology#Reward and Inhibitory-Control Circuit Differences

Cross-sectional imaging, treatment response and animal component models do not establish a uniform causal serotonin/dopamine defect. Imaging directions vary, and cause, consequence and disorder specificity remain unresolved.

Show evidence (1 reference)

PMID:32215560 SUPPORT PRIMARY RESULT Human Clinical

"the molecular basis of the striatal RSFC changes observed in our study is unclear"

Primary imaging study explicitly acknowledges the gap.

Does binge eating reduce negative affect?

INTERPRETATION bn-affect-measurement-timing

Attached to

pathophysiology#Negative Affect Around Binge Episodes

The 2017 article abstract says pre-binge ratings exceeded post-binge ratings, but the full results and BN table show post-binge ratings higher (26.72 versus 22.63). Pre-binge ratings were also much farther from the episode than post-binge ratings. Declining modeled post-binge trajectories and elevated proximal post-binge ratings can coexist; this does not justify universal immediate relief.

Show evidence (1 reference)

PMID:28851137 SUPPORT PRIMARY RESULT Human Clinical

"The results indicate that post-binge ratings of negative affect were significantly higher than the pre-binge ratings of negative affect for women in both Study 1-AN and Study 2-BN."

Use the full-text results and table rather than the reversed abstract statement.

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Pathophysiology

Multifactorial Liability

Familial genetic liability interacts with psychological and social risk factors. Twin and register-based estimates support heritability, but do not establish a single causal gene, a fixed molecular lesion, or genetic determinism.

Downstream

Shape and Weight Overvaluation with Dietary Restraint Familial and psychosocial susceptibility is associated with dieting, slim body ideals and low self-esteem; the direction and intermediates linking these factors remain uncertain.

Show evidence (2 references)

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"Proband-wise concordance for narrowly defined bulimia was 22.9% in monozygotic and 8.7% in dizygotic twins."

Greater monozygotic concordance supports familial genetic liability in this female twin cohort.

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"Risk factors for bulimia included 1) birth after 1960, 2) low paternal care, 3) a history of wide weight fluctuation, dieting, or frequent exercise, 4) a slim ideal body image, 5) low self-esteem, 6) an external locus of control, and 7) high levels of neuroticism."

These are associated risk factors, not independently proven causal exposures.

Shape and Weight Overvaluation with Dietary Restraint

Excessive dependence of self-evaluation on shape or weight, restrictive eating rules, and irregular eating contribute to a cognitive-behavioral maintenance model. These are targets of CBT; their relationship to molecular or imaging findings is not an established linear causal sequence.

Downstream

Loss-of-Control Binge Eating Restrictive eating and shape/weight concerns are proposed contributors to the maintenance of binge eating.

Show evidence (2 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"BN is characterized by overvaluation of body weight and shape and recurrent binge-eating"

Clinical synthesis identifies the central cognitive and behavioral features.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"follow by addressing the eating disorder psychopathology (for example, the extreme dietary restraint, the concerns about body shape and weight, and the tendency to binge eat in response to difficult thoughts and feelings)"

Guideline identifies the maintenance processes targeted by CBT.

Negative Affect Around Binge Episodes

Negative affect commonly rises before binge eating. Whether it is lower afterward depends on the sampling time and analysis. In a BN ecological momentary assessment reanalysis, proximal post-binge affect was higher than the earlier pre-binge rating, while modeled trajectories could still decline after an episode. This supports a qualified affect-regulation model, not universal or proven relief from bingeing or purging.

Downstream

Loss-of-Control Binge Eating Negative affect is a temporally associated antecedent and proposed trigger; observational assessments do not establish causation.

Show evidence (3 references)

PMID:21574678 SUPPORT REVIEW SYNTHESIS Human Clinical

"Results supported greater NA preceding binge eating relative to average affect (ES = 0.63) and affect before regular eating (ES = 0.68)."

The meta-analysis includes several binge-eating diagnoses; it supports an antecedent association rather than BN-specific causal proof.

PMID:28851137 SUPPORT PRIMARY RESULT Human Clinical

"The results indicate that post-binge ratings of negative affect were significantly higher than the pre-binge ratings of negative affect for women in both Study 1-AN and Study 2-BN."

Full-text results resolve the opposite direction stated in the abstract. BN results are analyzed separately from AN.

PMID:28851137 SUPPORT INDIRECT PRIMARY RESULT Human Clinical

"the post-binge ratings were made significantly closer in time to the binge-eating episode than the pre-binge ratings"

Unequal timing limits inference from a simple before/after comparison; binge-only episodes were analyzed.

Reward and Inhibitory-Control Circuit Differences

Human imaging identifies altered striatal, prefrontal, thalamic, sensorimotor and visual network function. Direction varies by network and paradigm, so this is not a uniform reward deficit. Resting-state correlations do not measure neuronal inhibition directly and cannot establish whether findings are causes or consequences of illness.

striatum UBERON:0002435 cerebral cortex UBERON:0000956

Downstream

Loss-of-Control Binge Eating Altered reward and control networks may relate to binge eating, but cross-sectional imaging cannot determine whether these differences precede illness or result from it.

Show evidence (3 references)

PMID:32215560 SUPPORT PRIMARY RESULT Human Clinical

"We calculated the functional connectivity of striatal subregions based on the resting-state functional Magnetic Resonance Imaging data of 51 bulimia nervosa patients and 53 healthy women."

Defines the primary human imaging cohort.

PMID:32215560 SUPPORT INDIRECT PRIMARY RESULT Human Clinical

"the molecular basis of the striatal RSFC changes observed in our study is unclear"

The full-text limitation prevents assignment of a measured serotonin or dopamine lesion from these imaging data.

PMID:32215560 SUPPORT PRIMARY RESULT Human Clinical

"Only for the putamen subregions, we observed reduced negative functional connectivity in the prefrontal (bilateral superior and middle frontal gyri) and parietal (right inferior parietal lobe and precuneus) areas."

A specific connectivity result, not proof of globally reduced reward activation.

Nucleus Accumbens Volume Reduction

Coordinated multi-site structural MRI analysis identified reduced nucleus accumbens volume in BN compared to controls. The nucleus accumbens is central to reward processing and motivated behavior. Volume reduction may reflect altered reward circuit development or maintenance, though cross-sectional findings cannot establish causation or temporal precedence.

nucleus accumbens UBERON:0001882

Show evidence (1 reference)

PMID:42747849 SUPPORT PRIMARY RESULT Human Clinical

"the BN group had lower nucleus accumbens volume (Cohen d, -0.20; 95% CI, -0.34 to -0.06)"

ENIGMA coordinated analysis of 369 BN and 417 control participants showing reduced nucleus accumbens volume as a structural marker of BN diagnosis.

Superior and Transverse Temporal Cortex Surface Area Reduction

Coordinated multi-site MRI analysis identified reduced cortical surface area (not thickness) in the superior temporal gyrus and transverse temporal cortex regions in BN compared to controls. Surface area reduction showed graded association with binge-eating severity (r = -0.14 to -0.20 across regions). These temporal regions implicate circuits beyond reward circuitry in BN pathophysiology.

superior temporal gyrus UBERON:0002769 temporal lobe UBERON:0001871

Downstream

Loss-of-Control Binge Eating Surface area reduction in temporal cortex shows graded association with binge-eating severity in a cross-sectional design; causality and temporal precedence remain unestablished. The association implicates temporal regions in BN symptom severity.

Show evidence (3 references)

PMID:42747849 SUPPORT PRIMARY RESULT Human Clinical

"lower cortical SA of the superior temporal (d, -0.26; 95% CI, -0.41 to -0.12) and transverse temporal cortices (d, -0.24; 95% CI, -0.38 to -0.10)"

ENIGMA multi-site structural MRI finding showing reduced surface area in temporal cortex regions in BN participants.

PMID:42747849 SUPPORT PRIMARY RESULT Human Clinical

"Binge-eating frequency was associated with lower SA of the superior temporal cortex, insula, pars orbitalis, and medial orbitofrontal, rostral middle frontal, and isthmus and posterior cingulate gyri (r value range, -0.20 to -0.14)"

The severity of binge eating shows graded association with cortical surface area reduction in multiple regions, strongest in superior temporal cortex.

PMID:42747849 SUPPORT PRIMARY RESULT Human Clinical

"Most differences remained significant when controlling for cohort-level variation in body mass index, illness duration, depressive symptoms, psychotropic medication use, and purging as a compensatory behavior."

Multi-site ENIGMA findings remain robust to confounding by BMI, depression, illness duration, and medication use, strengthening evidence that structural differences are associated with BN rather than being secondary to comorbidities.

Loss-of-Control Binge Eating

Recurrent episodes involve an objectively large amount of food and a sense of loss of control under DSM criteria. Binge eating also occurs in other eating disorders; the associated compensatory behavior and shape/weight psychopathology define the BN context.

Animal models

Restriction-refeeding rat paradigms Rat partially recapitulates Excessive intake is observed; subjective loss of control and shape/weight overvaluation cannot be inferred.

Downstream

Compensatory Behaviors Binge episodes are followed by attempts to counter perceived weight gain.

Bulimic Eating Behavior Binge eating with compensatory behavior constitutes the defining clinical pattern.

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"consuming an excessive caloric amount in a short period of time, usually a 2-hour period, that the patient feels unable to control"

Defines the binge event in this clinical review.

Compensatory Behaviors

Vomiting and laxative or diuretic misuse are purging methods; fasting and excessive exercise are nonpurging compensatory behaviors. Their physical consequences differ. The following electrolyte and acid-exposure pathways specifically concern relevant purging methods.

Animal models

Gastric sham-feeding rat paradigm Rat partially recapitulates Gastric drainage mimics loss of ingested contents without the intentional or emetic components of human compensation.

Downstream

Vomiting Self-induced vomiting is one compensatory method.

Gastric Acid Exposure and Mucosal Injury Vomiting exposes teeth and upper gastrointestinal mucosa to acid and mechanical trauma.

Salivary Acinar Enlargement Recurrent vomiting is associated with sialadenosis; its precise mechanism remains uncertain.

Purging-Related Volume and Electrolyte Loss Vomiting, diarrhea from laxative misuse, and diuretic misuse can deplete fluid and electrolytes.

Laxative-Related Bicarbonate Loss Laxative-induced diarrhea can remove bicarbonate and potassium.

Constipation Chronic laxative misuse can be followed by rebound constipation on withdrawal; this does not establish permanent cathartic-colon damage.

Show evidence (2 references)

PMID:42532999 SUPPORT REVIEW SYNTHESIS Human Clinical

"its cardinal feature is recurrent binge eating followed by extreme weight control or compensatory behaviours in association with high levels of weight and shape, and other body image and eating, preoccupations."

The contemporary primer defines the syndrome.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"compensatory behaviours, including laxative or diet pill misuse, vomiting or excessive exercise"

Guideline assessment encompasses multiple forms of compensation.

Gastric Acid Exposure and Mucosal Injury

Repeated vomiting exposes dental enamel and esophageal mucosa to gastric acid and mechanical injury. Dental erosion may be irreversible. Reflux complaints do not reliably indicate severe endoscopic injury; tears and rupture are uncommon severe complications.

esophagus UBERON:0001043

Downstream

Dental Erosion Acid exposure erodes enamel.

Gastroesophageal Reflux Vomiting and sphincter dysfunction can contribute to reflux symptoms.

Esophagitis Acid exposure can inflame or erode esophageal mucosa.

Hematemesis Repeated retching can cause bleeding mucosal tears.

Show evidence (2 references)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"With repetitive vomiting, the esophageal epithelium suffers repeated abnormal exposure to acidic gastric contents and microtrauma."

Provides the direct local injury mechanism.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Dental erosions are irreversible once they have developed."

Separates persistent enamel loss from reversible systemic disturbances.

Salivary Acinar Enlargement

Vomiting-associated sialadenosis consists of non-inflammatory acinar hypertrophy, usually involving both parotid glands. The precise trigger is uncertain; it must not be equated with inflammatory sialadenitis. Serum amylase elevation may be salivary rather than pancreatic.

parotid gland UBERON:0001831

Downstream

Parotid Gland Enlargement Acinar hypertrophy manifests as gland enlargement.

Hyperamylasemia Salivary amylase can contribute to increased circulating total amylase.

Show evidence (2 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Pathology study reveals hypertrophied acinar cells with otherwise preserved architecture without evidence of inflammation."

Describes salivary tissue pathology.

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Isoenzyme studies further demonstrate that the elevations in serum amylase originate from salivary glands as opposed to the pancreas"

Supports the salivary origin of hyperamylasemia in the studied purging population.

Secondary Hyperaldosteronism and Renal Potassium Loss

Volume depletion activates renin-angiotensin-aldosterone signaling. Aldosterone promotes sodium retention at the expense of renal potassium and hydrogen loss. Vomiting-related acid loss, volume contraction and renal bicarbonate retention sustain hypokalemic metabolic alkalosis. Renal potassium loss can exceed the direct gastrointestinal loss.

kidney UBERON:0002113

Downstream

Hypokalemia Renal potassium wasting contributes to hypokalemia.

Metabolic Alkalosis Acid loss and renal retention of bicarbonate sustain alkalosis.

Hypokalemia-Related Cardiac Electrical Instability Potassium depletion can disturb cardiac repolarization.

Post-Purging Sodium and Water Retention Persistent aldosterone activity can cause fluid retention when ongoing losses cease.

Show evidence (3 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Aldosterone also promotes renal secretion of potassium into the urine and thus hypokalemia."

Defines a key renal mechanism.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"This mechanism of potassium loss is actually a larger contributor to the hypokalemia than the actual gastrointestinal or urinary loses from the behaviors themselves."

Distinguishes secondary renal loss from direct loss.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Intravascular volume depletion resulting from the loss of sodium chloride increases the resorption of bicarbonate within the proximal renal tubule, preventing its loss in the urine"

Explains maintenance of alkalosis.

Post-Purging Sodium and Water Retention

In pseudo-Bartter physiology, aldosterone remains elevated after purging stops. Continued renal sodium retention without ongoing fluid loss can produce rapid edema and distressing weight gain, especially with rapid saline administration. This is acquired physiology, not inherited Bartter syndrome.

Downstream

Peripheral Edema Retained sodium and water cause edema.

Show evidence (2 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"The reason is that the serum aldosterone levels remain high, causing salt and water retention even though the patient is no longer losing fluid, as the purging has ceased."

Explains edema after cessation.

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"can result in severe peripheral edema formation especially if the patient with bulimia is given intravenous saline-containing fluids in a rapid manner"

Documents the fluid-treatment interaction.

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Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.

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Phenotypes

Blood 1

Hematemesis HP:0002248

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Mallory-Weiss tears commonly present as blood-streaked or tinged emesis or scant coffee ground emesis following recurrent vomiting episodes."

Supports the bleeding manifestation.

Cardiovascular 4

Orthostatic Hypotension HP:0001278

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Dehydration as a result of repeated episodes of emesis can result in both resting and exertional sinus tachycardia, hypotension, and orthostasis."

Supports hemodynamic complications.

Prolonged QTc Interval HP:0005184

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"The resultant hypokalaemia can result in a prolonged QTc interval"

Supports the acquired ECG abnormality.

Cardiac Arrhythmia HP:0011675

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"The most severe of these is a specific type of ventricular tachycardia known as torsades de pointes that can be fatal"

Documents a severe arrhythmic complication.

Syncope HP:0001279

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"significant arrhythmias resulting in syncope and palpitations"

Supports syncope as a complication.

Digestive 4

Vomiting HP:0002013

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Self-induced vomiting is the most frequently used purging method"

Supports vomiting while allowing other methods.

Gastroesophageal Reflux HP:0002020

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Patients who induce vomiting will commonly complain of symptoms consistent with gastroesophageal reflux (GERD), dysphagia, and odynophagia"

Supports symptomatic reflux.

Esophagitis HP:0100633

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"endoscopic evaluation is generally normal or only demonstrates mild esophagitis"

Keeps the structural finding proportional to the clinical evidence.

Constipation HP:0002019

Show evidence (2 references)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"A history of prolonged laxative use may also produce a more innocuous reflex constipation."

Supports rebound constipation.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"it is currently speculative as to whether this condition truly develops in those with eating disorders and with use of currently available stimulant laxatives."

Limits the stronger historical claim about cathartic colon.

Genitourinary 1

Irregular Menstruation HP:0000858

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"A potential endocrine complication of BN is irregular menses"

Supports the specific menstrual phenotype.

Head and Neck 2

Dental Erosion Abnormal dental enamel morphology HP:0000682

Coarse binding: no hpo term

Ontology gap: HPO searches for dental erosion and enamel erosion found no dedicated acquired-erosion term. Abnormal dental enamel morphology is the closest broader binding; developmental enamel hypoplasia would assert a different process. No term request has been filed.

Show evidence (2 references)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Dental erosions typically occur on the lingual surface of the maxillary teeth."

Defines the distribution of erosion.

PMID:28972588 SUPPORT REVIEW SYNTHESIS Human Clinical

"While there is consensus that bulimic behaviour directly causes dental erosion due to vomiting and acidic food choices, there is less clear evidence for a direct link between bulimia nervosa and dental caries"

Supports erosion and limits extrapolation to caries.

Parotid Gland Enlargement Enlargement of parotid gland HP:0011801

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"The bilateral parotid glands are the glands most commonly involved, but submandibular enlargement may also be seen"

Specifies the glands involved.

Metabolism 8

Hypokalemia HP:0002900

Show evidence (1 reference)

PMID:11746288 SUPPORT PRIMARY RESULT Human Clinical

"patients showed more frequent occurrence of low values for serum potassium (6.8% vs. 0.9%; p <.05) and chloride (8.1% vs. 0.9%; p <.02)."

Study of 74 otherwise healthy, medication-free, normal-weight outpatient women with purging BN; these rates are not universal.

Hypochloremia HP:0003113

Show evidence (1 reference)

PMID:11746288 SUPPORT PRIMARY RESULT Human Clinical

"patients showed more frequent occurrence of low values for serum potassium (6.8% vs. 0.9%; p <.05) and chloride (8.1% vs. 0.9%; p <.02)."

Study of 74 otherwise healthy, medication-free, normal-weight outpatient women with purging BN; these rates are not universal.

Metabolic Alkalosis HP:0200114

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Patients with self-induced vomiting or diuretic abuse, or both, have been shown to present with hypokalemia, hypochloremia, and a metabolic alkalosis."

Identifies the clinical biochemical pattern.

Metabolic Acidosis HP:0001942

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"acute diarrhea of shorter duration results in a hyperchloremic metabolic acidosis"

Supports the method-specific complication.

Hyponatremia HP:0002902

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Hyponatremia can also be present with these 3 purging behaviors."

Clinical synthesis describes a possible complication.

Dehydration HP:0001944

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Repeated episodes of vomiting can lead to dehydration"

Supports dehydration.

Peripheral Edema HP:0000969

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"can result in severe peripheral edema formation especially if the patient with bulimia is given intravenous saline-containing fluids in a rapid manner"

Supports the conditional edema phenotype.

Hyperamylasemia HP:0410288

Show evidence (1 reference)

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"Isoenzyme studies further demonstrate that the elevations in serum amylase originate from salivary glands as opposed to the pancreas"

Supports salivary hyperamylasemia.

Nervous System 4

Bulimic Eating Behavior Bulimia HP:0100739

Show evidence (1 reference)

PMID:42532999 SUPPORT REVIEW SYNTHESIS Human Clinical

"its cardinal feature is recurrent binge eating followed by extreme weight control or compensatory behaviours"

Contemporary synthesis supports the combined phenotype.

Depressive Symptoms Depression HP:0000716

Show evidence (1 reference)

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"Significant comorbidity was found between bulimia and anorexia nervosa, alcoholism, panic disorder, generalized anxiety disorder, phobia, and major depression."

Population-based clinical study supports comorbidity.

Anxiety HP:0000739

Show evidence (1 reference)

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"Significant comorbidity was found between bulimia and anorexia nervosa, alcoholism, panic disorder, generalized anxiety disorder, phobia, and major depression."

Supports comorbidity without an onset-order claim.

Impulsivity HP:0100710

Show evidence (2 references)

PMID:37218020 SUPPORT PRIMARY RESULT Human Clinical

"The average TFEQ Disinhibition score was clinically elevated at baseline"

Supports eating-specific disinhibition in this selected sample.

PMID:37218020 SUPPORT PRIMARY RESULT Human Clinical

"the BIS-11 impulsivity scales were not elevated at baseline relative to clinical norms"

Limits the generalized-trait claim.

🧬

Genetic Associations

Complex polygenic liability (Risk Factor)

Show evidence (4 references)

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"The best-fitting model indicated that familial aggregation was due solely to genetic factors with a heritability of liability of 55%."

Model-based estimate in the historic female twin cohort.

DOI:10.1038/s41467-025-61496-5 SUPPORT PRIMARY RESULT Human Clinical

"BN as 0.39 (95% CI: 0.32– 0.46)"

BN-specific estimate from the published register study, replacing the earlier preprint.

DOI:10.1038/s41467-025-61496-5 SUPPORT PRIMARY RESULT Human Clinical

"We did not account for the inﬂuence of shared environmental factors among close relatives on heritability and genetic correlation estimates."

The full-text limitation constrains causal and quantitative interpretation.

+ 1 more reference

💊

Medical Actions

Eating-Disorder-Focused Cognitive Behavioral Therapy

Action: Cognitive Behavior Therapy NCIT:C64345

Platform: Behavioral / lifestyle

CBT addresses regular eating, rigid dietary rules, overvaluation of shape and weight, emotional triggers and relapse prevention. NICE recommends individual CBT when guided self-help is unsuitable or ineffective; APA recommends eating-disorder-focused CBT for adults together with a serotonin reuptake inhibitor. Medication should not be the sole treatment.

Mechanism Target:

MODULATES Shape and Weight Overvaluation with Dietary Restraint — CBT addresses rigid eating rules and shape/weight concerns.

MODULATES Negative Affect Around Binge Episodes — CBT develops responses to difficult thoughts and feelings that can trigger binge eating.

Show evidence (3 references)

PMID:17370288 SUPPORT REVIEW SYNTHESIS Human Clinical

"Cognitive behavioral therapy reduces core behavioral and psychological features in the short and long term."

Systematic review supports CBT efficacy.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

Specifies CBT targets.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Do not offer medication as the sole treatment for bulimia nervosa."

Psychological care remains central.

Guided Cognitive Behavioral Self-Help

Action: Cognitive Behavior Therapy NCIT:C64345

Platform: Behavioral / lifestyle

NICE advises considering BN-focused guided self-help for adults, using structured cognitive behavioral materials with brief supportive sessions. Assess response and consider individual CBT if it is unacceptable, contraindicated or ineffective after four weeks.

Show evidence (2 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Consider bulimia-nervosa-focused guided self-help for adults with bulimia nervosa."

Adult guided self-help recommendation.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"use cognitive behavioural self-help materials for eating disorders"

Specifies the intervention content.

Family-Based Treatment for Adolescents

Action: Family Therapy NCIT:C93347

Platform: Behavioral / lifestyle

Family-based treatment collaboratively supports regular eating and reduction of compensatory behaviors without blaming families. In a randomized trial of adolescents with full or partial BN, FBT-BN yielded higher abstinence than adolescent CBT at end of treatment and six months, but the difference was not significant at twelve months. Missing follow-up and specialized settings limit generalization. Individual CBT is an alternative when family treatment is unsuitable or ineffective.

Mechanism Target:

MODULATES Compensatory Behaviors — Family-supported behavior change aims to reduce compensation.

MODULATES Loss-of-Control Binge Eating — Supported regular eating aims to interrupt recurrent binge episodes.

Show evidence (3 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"use a collaborative approach between the parents and the young person to establish regular eating patterns and minimise compensatory behaviours"

Family involvement is collaborative, not an assertion of family causation.

PMID:26506579 SUPPORT PRIMARY RESULT Human Clinical

"Participants in FBT-BN achieved higher abstinence rates than in CBT-A at end of treatment (39% versus 20%; p = .040, number needed to treat [NNT] = 5) and at 6-month follow-up (44% versus 25%; p = .030, NNT = 5)."

Randomized comparison; full text identifies 109 participants in these two arms of a three-arm study.

PMID:26506579 SUPPORT PRIMARY RESULT Human Clinical

"Abstinence rates between these 2 groups did not differ statistically at 12-month follow-up"

The longer follow-up does not establish sustained comparative superiority.

Fluoxetine Pharmacotherapy

Action: Pharmacotherapy NCIT:C15986

Agent: fluoxetine CHEBI:5118

Platform: Small molecule

Fluoxetine 60 mg/day has placebo-controlled evidence for reducing binge and vomiting frequency in adults. APA recommends a serotonin reuptake inhibitor with CBT initially or after minimal response to psychotherapy by six weeks. Treatment response does not demonstrate a primary serotonin deficiency. Insomnia, nausea, asthenia and tremor occurred more often than with placebo in the founding trial.

Mechanism Target:

MODULATES Loss-of-Control Binge Eating — Fluoxetine can reduce binge frequency; the disease-level molecular mechanism remains uncertain.

MODULATES Compensatory Behaviors — Randomized evidence supports reduced vomiting frequency.

Show evidence (3 references)

PMID:1550466 SUPPORT PRIMARY RESULT Human Clinical

"Fluoxetine at 60 mg/d proved superior to placebo in decreasing the frequency of weekly binge-eating and vomiting episodes at end point."

Eight-week randomized trial of 387 outpatient women, comparing 60 mg, 20 mg and placebo.

url:https://www.guidelinecentral.com/guideline/1971974/pocket-guide/2441963/ SUPPORT REVIEW SYNTHESIS Other

"either initially or if there is minimal or no response to psychotherapy alone by 6 weeks of treatment."

The final APA 2023 recommendation combines medication with eating-disorder-focused CBT.

PMID:1550466 SUPPORT PRIMARY RESULT Human Clinical

"Several adverse events (ie, insomnia, nausea, asthenia, and tremor) occurred significantly more frequently with fluoxetine (60 or 20 mg/d) than with placebo."

Trial adverse effects; discontinuation due to adverse events did not differ significantly.

Off-Label Topiramate

Action: Pharmacotherapy NCIT:C15986

Agent: topiramate CHEBI:63631

Platform: Small molecule

Topiramate has randomized short-term efficacy evidence and is recommended in the 2023 WFSBP pharmacological guideline, but has no eating-disorder marketing authorization. In a 69-person trial with 64 included in the intention-to-treat analysis, weekly binge/purge days decreased more than with placebo; not every secondary endpoint was significant. Specialist assessment of tolerability and individual risks is required.

Mechanism Target:

MODULATES Loss-of-Control Binge Eating — Short-term trial evidence supports reduction in binge/purge days.

Show evidence (2 references)

PMID:14658948 SUPPORT PRIMARY RESULT Human Clinical

"The primary efficacy measure, mean weekly number of binge and/or purge days, decreased 44.8% from baseline with topiramate versus 10.7% with placebo (p =.004)."

Ten-week randomized trial; this is change in days, not a remission rate.

PMID:37350265 SUPPORT REVIEW SYNTHESIS Human Clinical

"Despite the published evidence, olanzapine and topiramate have not received marketing authorisation for use in EDs from any medicine regulatory agency."

Guideline separates evidence from regulatory authorization.

Medical Stabilization and Electrolyte Replacement

Action: Therapeutic Procedure NCIT:C49236

Agent: potassium chloride CHEBI:32588

Platform: Other

Assess fluid and electrolyte balance and ECG risk in purging presentations. Severe electrolyte imbalance, dehydration or impending organ failure requires urgent medical care. Replace potassium and correct volume depletion under monitoring; oral replacement is preferred when the disturbance is not severe and absorption is adequate. Rapid fluid replacement can worsen pseudo-Bartter edema.

Mechanism Target:

MODULATES Purging-Related Volume and Electrolyte Loss — Monitored replacement restores volume and electrolytes.

MODULATES Secondary Hyperaldosteronism and Renal Potassium Loss — Correction of depletion reduces ongoing aldosterone-driven loss.

Show evidence (3 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Provide acute medical care (including emergency admission) for people with an eating disorder who have severe electrolyte imbalance, severe malnutrition, severe dehydration or signs of incipient organ failure."

Defines acute escalation indications.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"For people with an eating disorder who need supplements to restore electrolyte balance, offer these orally unless the person has problems with gastrointestinal absorption or the electrolyte disturbance is severe."

Replacement route depends on clinical severity.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Correcting the patient’s volume depletion is required to correct the metabolic alkalosis and interrupt renin-angiotensin-aldosterone system activation."

Volume and potassium deficits must be treated together.

Management of Post-Purging Edema

Action: Pharmacotherapy NCIT:C15986

Agent: spironolactone CHEBI:9241

Platform: Small molecule

Explain pseudo-Bartter fluid retention when purging stops and monitor fluid balance. The clinical review describes judicious fluid replacement and short-term spironolactone in selected patients to counter persistent aldosterone activity. This is supervised treatment of acquired physiology, not use of diuretics for weight control.

Mechanism Target:

MODULATES Post-Purging Sodium and Water Retention — Selected short-term aldosterone blockade can reduce post-purging fluid retention.

Show evidence (2 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"The reason is that the serum aldosterone levels remain high, causing salt and water retention even though the patient is no longer losing fluid, as the purging has ceased."

Defines the physiology that management addresses.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Spironolactone is generally continued for 2 to 4 weeks and then should be tapered by 50 mg every few days thereafter."

Clinical review describes a short, monitored course for pseudo-Bartter edema.

Dental Care and Acid-Exposure Reduction

Action: Dental Procedure NCIT:C38052

Platform: Other

Arrange regular dental assessment and treatment of erosive injury. After vomiting, avoid immediate tooth brushing and use a non-acid rinse; avoid highly acidic food and drinks. Established enamel loss is irreversible, so behavioral recovery does not itself restore lost enamel.

Mechanism Target:

MODULATES Gastric Acid Exposure and Mucosal Injury — Oral care and reduced acid exposure limit additional dental injury.

Show evidence (3 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"avoid brushing teeth immediately after vomiting"

Reduces abrasion of acid-softened enamel.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"rinse with non‑acid mouthwash after vomiting"

Guideline oral-care advice.

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"Dental erosions are irreversible once they have developed."

Distinguishes prevention of further injury from reversal of existing enamel loss.

Regular Eating and Cessation of Compensatory Behaviors

Action: Therapeutic Procedure NCIT:C49236

Platform: Behavioral / lifestyle

Establish regular meals within psychological treatment, with nutritional support as needed. Explain that laxatives and diuretics do not prevent calorie absorption; reduce and stop misuse with clinical support, and stop excessive exercise. Weight loss is not the purpose of BN treatment.

Mechanism Target:

MODULATES Shape and Weight Overvaluation with Dietary Restraint — Regular eating reduces extreme restraint and irregular intake.

MODULATES Compensatory Behaviors — Supported cessation reduces purging-related medical injury.

Show evidence (3 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"establishing a pattern of regular eating, and providing encouragement, advice and support while people do this"

Core early CBT intervention.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"that laxatives and diuretics do not reduce calorie absorption and so do not help with weight loss"

Corrects the rationale sustaining misuse.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"to gradually reduce and stop laxative or diuretic use"

Cessation should be supported and monitored.

Medication Safety Review

Action: Therapeutic Procedure NCIT:C49236

Platform: Other

Review medications in the context of electrolyte disturbance, cardiac risk and comorbid psychiatric needs. Bupropion is contraindicated with a current or prior diagnosis of bulimia nervosa because of increased seizure risk; it must not be generalized from a list of antidepressants studied in eating disorders.

Show evidence (1 reference)

url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=bcb4ef83-f272-4090-8547-9aaf4ab63667 SUPPORT REVIEW SYNTHESIS Other

"Bupropion hydrochloride tablets are contraindicated in patients with a current or prior diagnosis of bulimia or anorexia nervosa as a higher incidence of seizures was observed in such patients treated with bupropion hydrochloride tablets"

Current drug-label contraindication; this supports avoidance, not administration.

Conditional Digital Guided Self-Help

Action: Cognitive Behavior Therapy NCIT:C64345

Platform: Behavioral / lifestyle

NICE HTG768 (January 2026) permits Overcoming Bulimia Online during a two-year evidence-generation period in the NHS for selected adults after clinical assessment and with usual physical monitoring and waiting-list support. This conditional recommendation does not establish equivalence of all apps or suitability for severe illness. Other named technologies remain research-only.

Show evidence (1 reference)

url:https://www.nice.org.uk/guidance/htg768/chapter/1-Recommendations SUPPORT REVIEW SYNTHESIS Other

"Overcoming Bulimia Online can be used in the NHS during the evidence generation period as an option to treat the following conditions in adults:"

Conditional early-value recommendation, subject to the guidance safeguards.

Investigational Lisdexamfetamine

Action: Pharmacotherapy NCIT:C15986

Agent: lisdexamfetamine CHEBI:135925

Platform: Small molecule

Lisdexamfetamine remains investigational for BN. An uncontrolled eight-week study enrolled 23 participants, with 18 completing per protocol, and reported symptom reductions alongside mean heart-rate increase of 12.1 beats/min and weight loss of 2.1 kg; one participant was withdrawn for substantial weight loss. Secondary analyses are from the same cohort. These findings and the BED indication do not establish BN efficacy or support routine prescribing.

Show evidence (3 references)

PMID:33534199 NO_EVIDENCE PRIMARY RESULT Human Clinical

"However, the results should not be used as evidence for clinicians to prescribe LDX to individuals with BN before its efficacy and safety are properly tested."

The primary investigators explicitly limit clinical translation.

PMID:39137484 NO_EVIDENCE REVIEW SYNTHESIS Human Clinical

"There is currently insufficient evidence to support the use of stimulant medications to treat symptoms of BN or AN."

The systematic review does not support routine stimulant treatment.

PMID:33534199 SUPPORT PRIMARY RESULT Human Clinical

"There was a mean weight reduction of 2.1 kg and one participant was withdrawn for clinically significant weight loss."

Supports the observed weight-loss safety caveat, not efficacy or routine prescribing.

Comorbidity and Crisis Care

Action: Comorbidity and Crisis Care Ontology label: Therapeutic Procedure NCIT:C49236

Platform: Other

Coordinate eating-disorder treatment with care for depression, anxiety, substance use and other comorbid conditions. Acute suicide or other mental-health risk can require crisis or inpatient psychiatric care. The order and setting of treatment depend on severity, functioning and patient preferences.

Show evidence (1 reference)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Eating disorder specialists and other healthcare teams should collaborate to support effective treatment of physical or mental health comorbidities in people with an eating disorder."

Guideline supports coordinated clinical care.

Relapse Prevention

Action: Relapse Prevention Ontology label: Therapeutic Procedure NCIT:C49236

Platform: Behavioral / lifestyle

Develop a plan for maintaining regular eating, responding to recurrence of bingeing or compensatory behaviors, and returning to care promptly. Psychological treatment includes relapse-prevention work; long-term cohort recovery does not imply immunity from later relapse.

Show evidence (1 reference)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"towards the end of treatment, spread appointments further apart and focus on maintaining positive changes and minimising the risk of relapse"

BN-specific CBT recommendation.

🌍

Environmental Factors

Childhood trauma and abuse

Childhood trauma and abuse are nonspecific risk associations for eating disorders, with stronger associations reported for binge/purge presentations. These experiences are neither required nor sufficient for BN, and available observational studies do not establish a single causal pathway.

Show evidence (1 reference)

DOI:10.1186/s40337-022-00717-4 SUPPORT INDIRECT REVIEW SYNTHESIS Human Clinical

"these experiences are more strongly associated with binge-purge type disorders such as BN, BED, and AN-BP"

The rapid review identifies an association with childhood trauma and abuse across binge/purge diagnoses; it is not a necessary or sufficient cause of BN.

Mechanism Target:

PREDISPOSES Multifactorial Liability — Associated early adversity contributes to the psychosocial risk context; causal direction and mediating mechanisms remain incompletely resolved.

Show evidence (1 reference)

DOI:10.1186/s40337-022-00717-4 SUPPORT INDIRECT REVIEW SYNTHESIS Human Clinical

"these experiences are more strongly associated with binge-purge type disorders such as BN, BED, and AN-BP"

The rapid review identifies an association with childhood trauma and abuse across binge/purge diagnoses; it is not a necessary or sufficient cause of BN.

🔬

Diagnosis

Clinical Diagnostic Assessment

Assess recurrent objectively large binges with loss of control, compensatory behaviors and shape/weight overvaluation. DSM-5 requires bingeing and compensation at least weekly for three months and not exclusively during anorexia nervosa. Do not exclude BN solely because BMI is normal or high.

Clinical Evaluation NCIT:C124351

Show evidence (2 references)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"requires episodes of bingeing and compensatory behaviors in BN to occur at least once per week over the course of 3 months and not occur during an episode of anorexia nervosa."

Specifies DSM-5 frequency, duration and diagnostic boundary.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Do not use single measures such as BMI or duration of illness to determine whether to offer treatment for an eating disorder."

Appearance or a single anthropometric measure cannot determine treatment need.

Medical and Psychiatric Risk Assessment

Review purging methods and frequency, medications, fluid/electrolyte disturbance, vital signs, dental and gastrointestinal symptoms, mood, anxiety, self-harm and suicide risk. Consider ECG monitoring based on purging severity, electrolyte imbalance, symptoms and medication risks. Normal electrolytes in intermittent purging do not exclude the diagnosis.

Clinical Evaluation NCIT:C124351

Show evidence (5 references)

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Assess fluid and electrolyte balance in people with an eating disorder who are believed to be engaging in compensatory behaviours, such as vomiting, taking laxatives or diuretics, or water loading."

Guideline indication for medical assessment.

PMID:25866627 SUPPORT REVIEW SYNTHESIS Human Clinical

"The majority of patients with bulimia, who vomit only occasionally, will have normal serum electrolytes"

A normal test is not a reliable exclusion criterion.

url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations SUPPORT REVIEW SYNTHESIS Other

"Assess whether ECG monitoring is needed in people with an eating disorder, based on the following risk factors:"

Guideline then lists severe purging, electrolyte imbalance, hypotension, medication and rhythm risks; monitoring is risk-based.

+ 2 more references

📈

Progression

Variable long-term course

Remission and relapse can occur over many years. In a historic female treatment-seeking cohort, imputed recovery at 22 years was 68.2% among surviving participants with BN. Recovery required minimal symptoms for a year; the study does not demonstrate uninterrupted recovery during the long assessment gap or attribute outcome to a particular treatment. Of 107 BN survivors, 76 were re-interviewed and missing outcomes were imputed.

Show evidence (1 reference)

PMID:28002660 SUPPORT PRIMARY RESULT Human Clinical

"At 22-year follow-up, 62.8% of participants with anorexia nervosa and 68.2% of participants with bulimia nervosa recovered"

Diagnosis-specific long-term outcome; the BN figure must not be pooled with the AN figure.

Mortality and suicide risk

A 2026 meta-analysis found higher all-cause mortality in BN versus the general population (17 studies; pooled RR 2.39, 95% CI 1.86–3.06; I-squared 55%) and higher suicide-related mortality (RR 6.15, 95% CI 2.52–15.04). These are relative associations from observational cohorts with varying follow-up and ascertainment, not an individual absolute risk or proof that BN alone causes death. The overall review was predominantly female and evidence outside Western countries remained limited. Physical complications and suicide risk require assessment alongside recovery and relapse.

Show evidence (2 references)

PMID:41536100 SUPPORT DIRECT REVIEW SYNTHESIS Human Clinical

"BN (n=17, RR=2.39, 95% CI: 1.86‐3.06, I2=55%, p<0.001)."

BN-specific all-cause mortality estimate from the full-text results; do not transfer the higher AN estimate to BN.

PMID:41536100 SUPPORT DIRECT REVIEW SYNTHESIS Human Clinical

"RR=6.15, 95% CI: 2.52-15.04 in bulimia nervosa"

BN-specific suicide-related mortality estimate, distinct from the pooled eating-disorder result.

📊

Prevalence

Women (population-based female twin register, DSM-III-R narrowly defined)

Lifetime Prevalence 2800.0 per 100,000 >1 in 1,000

Historical DSM-III-R estimate in 2,163 female twins; lifetime prevalence was 2.8%, whereas lifetime risk was 4.2%. Neither number is a contemporary estimate for all sexes or diagnostic systems.

Show evidence (1 reference)

PMID:1842216 SUPPORT PRIMARY RESULT Human Clinical

"Lifetime prevalence and risk for narrowly defined bulimia were 2.8% and 4.2%, respectively."

Population-based twin study lifetime prevalence estimate for bulimia nervosa in women.

🔀

Differential Diagnoses

Conditions with similar clinical presentations that must be differentiated from Bulimia Nervosa:

Anorexia Nervosa MONDO:0005351

Overlapping Features Anorexia nervosa binge-eating/purging presentations can overlap with bulimia nervosa through binge eating and compensatory behaviors.

Distinguishing Features

Anorexia nervosa requires significantly low body weight or persistent restriction leading to low weight; bulimia nervosa does not require low body weight and is defined by recurrent binge eating with compensatory behaviors.

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"requires episodes of bingeing and compensatory behaviors in BN to occur at least once per week over the course of 3 months and not occur during an episode of anorexia nervosa."

The exclusion criterion separates BN from binge/purge symptoms occurring during anorexia nervosa.

Binge Eating Disorder MONDO:0005582

Overlapping Features Binge eating disorder overlaps with bulimia nervosa through recurrent binge eating and loss of control.

Distinguishing Features

Binge eating disorder lacks regular compensatory behaviors such as self-induced vomiting, laxative misuse, fasting, or excessive exercise.

Show evidence (1 reference)

url:https://www.ccjm.org/content/88/6/333 SUPPORT REVIEW SYNTHESIS Human Clinical

"patients with binge-eating disorder tend to be overweight or obese, as they do not purge after binge episodes."

The review contrasts binge-eating disorder with BN. Regular compensation is absent in BED; body weight alone is not diagnostic.

🔬

Clinical Trials

NCT07542145 PHASE_I RECRUITING

Planned 40-person treatment-development study of MDMA-assisted therapy, BN-adapted MDMA-assisted therapy and standard treatment over ten weeks, with six-month follow-up. Experimental; no established BN efficacy.

Show evidence (1 reference)

clinicaltrials:NCT07542145 SUPPORT Other

"This project will evaluate MDMA Assisted Therapy (MDMA-AT) assisted psychotherapy for the treatment of Bulimia Nervosa (BN) over a 10-week period."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT07581158 NOT_APPLICABLE NOT_RECRUITING

Planned 40-person randomized real-versus-sham fNIRS neurofeedback study combined with text-message intervention. Registry status is NOT_YET_RECRUITING, mapped here to NOT_RECRUITING; not evidence of benefit.

Show evidence (1 reference)

clinicaltrials:NCT07581158 SUPPORT Other

"The purpose of this study is to examine the effects of noninvasive prefrontal cortex (PFC) neurofeedback during eating in women with bulimia nervosa (BN) using wearable brain imaging, functional near-infrared spectroscopy (fNIRS), together with a brain-based 4-week text-messaging intervention."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT05614024 NOT_APPLICABLE RECRUITING

Planned 30-person real-versus-sham fNIRS neurofeedback study during eating. No completed efficacy result is claimed.

Show evidence (1 reference)

clinicaltrials:NCT05614024 SUPPORT Other

"The purpose of this study is to examine the effects of noninvasive prefrontal cortex (PFC) neurofeedback during eating in women with bulimia nervosa (BN) using a wearable brain imaging device, functional near-infrared spectroscopy (fNIRS)."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT03397446 PHASE_II TERMINATED

Eight-week open-label lisdexamfetamine feasibility study; actual enrollment 23 rather than the planned 30 in its brief summary. Termination reflected COVID-related resource constraints, not a registry determination of toxicity. Published findings do not support routine prescribing.

Show evidence (1 reference)

clinicaltrials:NCT03397446 SUPPORT Other

"The relatively high rates of bulimia nervosa (BN) in attention-deficit/hyperactivity disorder (ADHD) cohorts suggest a relationship between the two disorders."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT04225221 PHASE_II COMPLETED

Ovarian-hormone manipulation study: leuprolide suppression followed by separate estradiol/progesterone add-back in a blinded crossover design. Actual enrollment 10 rather than the 15 planned in the summary; registry results are posted. This is a mechanism study, not established hormonal treatment for BN.

Show evidence (1 reference)

clinicaltrials:NCT04225221 SUPPORT Other

"This pilot study experimentally manipulates ovarian hormones to examine the direct impact of estrogen (E2) and progesterone (P4) on binge eating symptom burden and the behavioral reward response in women with bulimia nervosa (n=15)."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT06063278 NOT_APPLICABLE COMPLETED

Step-by-Step group treatment study with actual enrollment 100 and a nonrandomized controlled waitlist comparison. Follow-up extends to two years; the registry does not provide published efficacy results.

Show evidence (1 reference)

clinicaltrials:NCT06063278 SUPPORT Other

"This a pseudo-randomized clinical trial that examines if a specific group therapy for BN is effective in improving its symptomatology, and what variables mediate such improvements."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT05728021 NOT_APPLICABLE UNKNOWN

Planned randomized 172-person Recovery Record guided-app aftercare study added to treatment as usual. The registry status is UNKNOWN, so current recruitment or completion is not inferred.

Show evidence (1 reference)

clinicaltrials:NCT05728021 SUPPORT Other

"Inpatient treatment for patients with bulimia nervosa (BN) is recommended in extreme or severe cases and/or after failure of outpatient treatment and is highly effective."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

NCT05995496 NOT_APPLICABLE RECRUITING

Planned 150-person basic-mechanism study of fasted/fed neural computations using fMRI and behavioral tasks. This is not a therapeutic efficacy trial.

Show evidence (1 reference)

clinicaltrials:NCT05995496 SUPPORT Other

"An impaired ability to exert control has been implicated in bulimia nervosa (BN), but this impairment may not represent a stable trait or be the most effective focus for treatment."

Registry protocol description; it does not establish efficacy or replace published outcome evidence.

🐁

Animal Models

Restriction-refeeding rat paradigms

Food restriction followed by refeeding, sometimes with stress or palatable food, models selected binge-eating components. It does not reproduce the full cognitive, social or compensatory syndrome.

Species

Rat

Pathograph links

Loss-of-Control Binge Eating partially recapitulates fidelity: low Excessive intake is observed; subjective loss of control and shape/weight overvaluation cannot be inferred.

Show evidence (1 reference)

PMID:22138162 SUPPORT REVIEW SYNTHESIS Model Organism

"When they return to a normal body weight and feeding regimen, rats with a history of restriction and refeeding continue to exhibit binge-eating behavior, even when sated."

Restriction-refeeding paradigms reproduce aspects of excessive intake, not human body-image cognition or a full BN syndrome.

Gastric sham-feeding rat paradigm

An open gastric fistula permits intake with little nutrient retention. This probes reward and satiety components but does not model self-induced vomiting, because rats lack an emetic reflex.

Species

Rat

Pathograph links

Compensatory Behaviors partially recapitulates fidelity: low Gastric drainage mimics loss of ingested contents without the intentional or emetic components of human compensation.

Show evidence (1 reference)

PMID:22138162 SUPPORT REVIEW SYNTHESIS Model Organism

"The sham feeding preparation allows for the rat to taste food but retain minimal calories or nutrients, as the food is expelled through a cannula inserted in the stomach or the esophagus"

Experimental drainage separates oral reward from postingestive feedback; it is not voluntary human vomiting.

{ }

Source YAML

click to show

name: Bulimia Nervosa
creation_date: "2026-04-28T00:00:00Z"
category: Psychiatric
description: >-
  Bulimia nervosa is an eating disorder characterized by recurrent loss-of-control binge eating, recurrent
  inappropriate compensatory behaviors intended to prevent weight gain, and excessive influence of body shape
  or weight on self-evaluation. Compensation can involve vomiting, laxative or diuretic misuse, fasting, or
  excessive exercise. People often have normal or higher body weight; serious purging-related complications
  can occur without an underweight appearance. Liability is multifactorial, and psychological treatment is
  central to care.
disease_term:
  preferred_term: bulimia nervosa
  term:
    id: MONDO:0005452
    label: bulimia nervosa
parents:
- Eating Disorder
- Mental Health Disorder
pathophysiology:
- name: Multifactorial Liability
  description: Familial genetic liability interacts with psychological and social risk factors. Twin and register-based estimates support heritability, but do not establish a single causal gene, a fixed molecular lesion, or genetic determinism.
  biological_scale: ORGANISM
  evidence:
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Proband-wise concordance for narrowly defined bulimia was 22.9% in monozygotic and 8.7% in dizygotic twins.
    explanation: Greater monozygotic concordance supports familial genetic liability in this female twin cohort.
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Risk factors for bulimia included 1) birth after 1960, 2) low paternal care, 3) a history of wide weight fluctuation, dieting, or frequent exercise, 4) a slim ideal body image, 5) low self-esteem, 6) an external locus of control, and 7) high levels of neuroticism.
    explanation: These are associated risk factors, not independently proven causal exposures.
  downstream:
  - target: Shape and Weight Overvaluation with Dietary Restraint
    causal_link_type: UNKNOWN
    description: Familial and psychosocial susceptibility is associated with dieting, slim body ideals and low self-esteem; the direction and intermediates linking these factors remain uncertain.
    evidence:
    - reference: PMID:1842216
      reference_title: The genetic epidemiology of bulimia nervosa.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      quote_role: PRIMARY_RESULT
      snippet: Risk factors for bulimia included 1) birth after 1960, 2) low paternal care, 3) a history of wide weight fluctuation, dieting, or frequent exercise, 4) a slim ideal body image, 5) low self-esteem, 6) an external locus of control, and 7) high levels of neuroticism.
      explanation: Associated risk factors connect liability to the cognitive-behavioral model; the twin study does not establish this causal sequence.
      directness: INDIRECT
- name: Shape and Weight Overvaluation with Dietary Restraint
  description: Excessive dependence of self-evaluation on shape or weight, restrictive eating rules, and irregular eating contribute to a cognitive-behavioral maintenance model. These are targets of CBT; their relationship to molecular or imaging findings is not an established linear causal sequence.
  biological_scale: ORGANISM
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: BN is characterized by overvaluation of body weight and shape and recurrent binge-eating
    explanation: Clinical synthesis identifies the central cognitive and behavioral features.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: follow by addressing the eating disorder psychopathology (for example, the extreme dietary restraint, the concerns about body shape and weight, and the tendency to binge eat in response to difficult thoughts and feelings)
    explanation: Guideline identifies the maintenance processes targeted by CBT.
  downstream:
  - target: Loss-of-Control Binge Eating
    description: Restrictive eating and shape/weight concerns are proposed contributors to the maintenance of binge eating.
    causal_link_type: UNKNOWN
- name: Negative Affect Around Binge Episodes
  description: Negative affect commonly rises before binge eating. Whether it is lower afterward depends on the sampling time and analysis. In a BN ecological momentary assessment reanalysis, proximal post-binge affect was higher than the earlier pre-binge rating, while modeled trajectories could still decline after an episode. This supports a qualified affect-regulation model, not universal or proven relief from bingeing or purging.
  biological_scale: ORGANISM
  evidence:
  - reference: PMID:21574678
    reference_title: "Revisiting the affect regulation model of binge eating: a meta-analysis of studies using ecological momentary assessment."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Results supported greater NA preceding binge eating relative to average affect (ES = 0.63) and affect before regular eating (ES = 0.68).
    explanation: The meta-analysis includes several binge-eating diagnoses; it supports an antecedent association rather than BN-specific causal proof.
  - reference: PMID:28851137
    reference_title: "Negative affect and binge eating: Reconciling differences between two analytic approaches in ecological momentary assessment research."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: The results indicate that post-binge ratings of negative affect were significantly higher than the pre-binge ratings of negative affect for women in both Study 1-AN and Study 2-BN.
    explanation: Full-text results resolve the opposite direction stated in the abstract. BN results are analyzed separately from AN.
  - reference: PMID:28851137
    reference_title: "Negative affect and binge eating: Reconciling differences between two analytic approaches in ecological momentary assessment research."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: the post-binge ratings were made significantly closer in time to the binge-eating episode than the pre-binge ratings
    explanation: Unequal timing limits inference from a simple before/after comparison; binge-only episodes were analyzed.
    directness: INDIRECT
  downstream:
  - target: Loss-of-Control Binge Eating
    description: Negative affect is a temporally associated antecedent and proposed trigger; observational assessments do not establish causation.
    causal_link_type: UNKNOWN
- name: Reward and Inhibitory-Control Circuit Differences
  description: Human imaging identifies altered striatal, prefrontal, thalamic, sensorimotor and visual network function. Direction varies by network and paradigm, so this is not a uniform reward deficit. Resting-state correlations do not measure neuronal inhibition directly and cannot establish whether findings are causes or consequences of illness.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:32215560
    reference_title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: We calculated the functional connectivity of striatal subregions based on the resting-state functional Magnetic Resonance Imaging data of 51 bulimia nervosa patients and 53 healthy women.
    explanation: Defines the primary human imaging cohort.
  - reference: PMID:32215560
    reference_title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: the molecular basis of the striatal RSFC changes observed in our study is unclear
    explanation: The full-text limitation prevents assignment of a measured serotonin or dopamine lesion from these imaging data.
    directness: INDIRECT
  - reference: PMID:32215560
    reference_title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Only for the putamen subregions, we observed reduced negative functional connectivity in the prefrontal (bilateral superior and middle frontal gyri) and parietal (right inferior parietal lobe and precuneus) areas.
    explanation: A specific connectivity result, not proof of globally reduced reward activation.
  locations:
  - preferred_term: striatum
    term:
      id: UBERON:0002435
      label: striatum
  - preferred_term: cerebral cortex
    term:
      id: UBERON:0000956
      label: cerebral cortex
  downstream:
  - target: Loss-of-Control Binge Eating
    causal_link_type: UNKNOWN
    description: Altered reward and control networks may relate to binge eating, but cross-sectional imaging cannot determine whether these differences precede illness or result from it.
    evidence:
    - reference: PMID:32215560
      reference_title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      quote_role: PRIMARY_RESULT
      snippet: Only for the putamen subregions, we observed reduced negative functional connectivity in the prefrontal (bilateral superior and middle frontal gyri) and parietal (right inferior parietal lobe and precuneus) areas.
      explanation: Cross-sectional connectivity differences are associated with BN, not proof that the imaging finding causes binge eating.
      directness: INDIRECT
- name: Nucleus Accumbens Volume Reduction
  description: Coordinated multi-site structural MRI analysis identified reduced nucleus accumbens volume in BN compared to controls. The nucleus accumbens is central to reward processing and motivated behavior. Volume reduction may reflect altered reward circuit development or maintenance, though cross-sectional findings cannot establish causation or temporal precedence.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:42747849
    reference_title: "Structural Brain Correlates of Bulimia Nervosa Diagnosis and Symptom Severity: A Coordinated ENIGMA Eating Disorders Working Group Analysis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: the BN group had lower nucleus accumbens volume (Cohen d, -0.20; 95% CI, -0.34 to -0.06)
    explanation: ENIGMA coordinated analysis of 369 BN and 417 control participants showing reduced nucleus accumbens volume as a structural marker of BN diagnosis.
  locations:
  - preferred_term: nucleus accumbens
    term:
      id: UBERON:0001882
      label: nucleus accumbens
  notes: >-
    The ENIGMA study identified reduced nucleus accumbens volume in BN compared to controls, but did not find an association with binge-eating frequency (where reduced volume was associated with superior temporal cortex surface area, not subcortical volume). Nucleus accumbens reduction is a diagnosis-level correlate, not severity-linked.
- name: Superior and Transverse Temporal Cortex Surface Area Reduction
  description: Coordinated multi-site MRI analysis identified reduced cortical surface area (not thickness) in the superior temporal gyrus and transverse temporal cortex regions in BN compared to controls. Surface area reduction showed graded association with binge-eating severity (r = -0.14 to -0.20 across regions). These temporal regions implicate circuits beyond reward circuitry in BN pathophysiology.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:42747849
    reference_title: "Structural Brain Correlates of Bulimia Nervosa Diagnosis and Symptom Severity: A Coordinated ENIGMA Eating Disorders Working Group Analysis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: lower cortical SA of the superior temporal (d, -0.26; 95% CI, -0.41 to -0.12) and transverse temporal cortices (d, -0.24; 95% CI, -0.38 to -0.10)
    explanation: ENIGMA multi-site structural MRI finding showing reduced surface area in temporal cortex regions in BN participants.
  - reference: PMID:42747849
    reference_title: "Structural Brain Correlates of Bulimia Nervosa Diagnosis and Symptom Severity: A Coordinated ENIGMA Eating Disorders Working Group Analysis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Binge-eating frequency was associated with lower SA of the superior temporal cortex, insula, pars orbitalis, and medial orbitofrontal, rostral middle frontal, and isthmus and posterior cingulate gyri (r value range, -0.20 to -0.14)
    explanation: The severity of binge eating shows graded association with cortical surface area reduction in multiple regions, strongest in superior temporal cortex.
  - reference: PMID:42747849
    reference_title: "Structural Brain Correlates of Bulimia Nervosa Diagnosis and Symptom Severity: A Coordinated ENIGMA Eating Disorders Working Group Analysis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Most differences remained significant when controlling for cohort-level variation in body mass index, illness duration, depressive symptoms, psychotropic medication use, and purging as a compensatory behavior.
    explanation: Multi-site ENIGMA findings remain robust to confounding by BMI, depression, illness duration, and medication use, strengthening evidence that structural differences are associated with BN rather than being secondary to comorbidities.
  locations:
  - preferred_term: superior temporal gyrus
    term:
      id: UBERON:0002769
      label: superior temporal gyrus
  - preferred_term: temporal lobe
    term:
      id: UBERON:0001871
      label: temporal lobe
  downstream:
  - target: Loss-of-Control Binge Eating
    causal_link_type: UNKNOWN
    description: Surface area reduction in temporal cortex shows graded association with binge-eating severity in a cross-sectional design; causality and temporal precedence remain unestablished. The association implicates temporal regions in BN symptom severity.
    evidence:
    - reference: PMID:42747849
      reference_title: "Structural Brain Correlates of Bulimia Nervosa Diagnosis and Symptom Severity: A Coordinated ENIGMA Eating Disorders Working Group Analysis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      quote_role: PRIMARY_RESULT
      snippet: Binge-eating frequency was associated with lower SA of the superior temporal cortex, insula, pars orbitalis, and medial orbitofrontal, rostral middle frontal, and isthmus and posterior cingulate gyri (r value range, -0.20 to -0.14)
      explanation: Graded association between binge-eating frequency and temporal cortex surface area reduction across multiple brain regions.
      directness: INDIRECT
- name: Loss-of-Control Binge Eating
  description: Recurrent episodes involve an objectively large amount of food and a sense of loss of control under DSM criteria. Binge eating also occurs in other eating disorders; the associated compensatory behavior and shape/weight psychopathology define the BN context.
  biological_scale: ORGANISM
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: consuming an excessive caloric amount in a short period of time, usually a 2-hour period, that the patient feels unable to control
    explanation: Defines the binge event in this clinical review.
  downstream:
  - target: Compensatory Behaviors
    description: Binge episodes are followed by attempts to counter perceived weight gain.
    causal_link_type: DIRECT
  - target: Bulimic Eating Behavior
    description: Binge eating with compensatory behavior constitutes the defining clinical pattern.
    causal_link_type: DIRECT
- name: Compensatory Behaviors
  description: Vomiting and laxative or diuretic misuse are purging methods; fasting and excessive exercise are nonpurging compensatory behaviors. Their physical consequences differ. The following electrolyte and acid-exposure pathways specifically concern relevant purging methods.
  biological_scale: ORGANISM
  evidence:
  - reference: PMID:42532999
    reference_title: Bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: its cardinal feature is recurrent binge eating followed by extreme weight control or compensatory behaviours in association with high levels of weight and shape, and other body image and eating, preoccupations.
    explanation: The contemporary primer defines the syndrome.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: compensatory behaviours, including laxative or diet pill misuse, vomiting or excessive exercise
    explanation: Guideline assessment encompasses multiple forms of compensation.
  downstream:
  - target: Vomiting
    description: Self-induced vomiting is one compensatory method.
    causal_link_type: DIRECT
  - target: Gastric Acid Exposure and Mucosal Injury
    description: Vomiting exposes teeth and upper gastrointestinal mucosa to acid and mechanical trauma.
    causal_link_type: DIRECT
  - target: Salivary Acinar Enlargement
    description: Recurrent vomiting is associated with sialadenosis; its precise mechanism remains uncertain.
    causal_link_type: UNKNOWN
  - target: Purging-Related Volume and Electrolyte Loss
    description: Vomiting, diarrhea from laxative misuse, and diuretic misuse can deplete fluid and electrolytes.
    causal_link_type: DIRECT
  - target: Laxative-Related Bicarbonate Loss
    description: Laxative-induced diarrhea can remove bicarbonate and potassium.
    causal_link_type: DIRECT
  - target: Constipation
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    description: Chronic laxative misuse can be followed by rebound constipation on withdrawal; this does not establish permanent cathartic-colon damage.
    intermediate_mechanisms:
    - Withdrawal after chronic laxative misuse
    evidence:
    - reference: PMID:25866627
      reference_title: Bulimia Nervosa - medical complications.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      snippet: A history of prolonged laxative use may also produce a more innocuous reflex constipation.
      explanation: Supports rebound constipation.
- name: Gastric Acid Exposure and Mucosal Injury
  description: Repeated vomiting exposes dental enamel and esophageal mucosa to gastric acid and mechanical injury. Dental erosion may be irreversible. Reflux complaints do not reliably indicate severe endoscopic injury; tears and rupture are uncommon severe complications.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: With repetitive vomiting, the esophageal epithelium suffers repeated abnormal exposure to acidic gastric contents and microtrauma.
    explanation: Provides the direct local injury mechanism.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Dental erosions are irreversible once they have developed.
    explanation: Separates persistent enamel loss from reversible systemic disturbances.
  downstream:
  - target: Dental Erosion
    description: Acid exposure erodes enamel.
    causal_link_type: DIRECT
  - target: Gastroesophageal Reflux
    description: Vomiting and sphincter dysfunction can contribute to reflux symptoms.
    causal_link_type: DIRECT
  - target: Esophagitis
    description: Acid exposure can inflame or erode esophageal mucosa.
    causal_link_type: DIRECT
  - target: Hematemesis
    description: Repeated retching can cause bleeding mucosal tears.
    causal_link_type: DIRECT
  locations:
  - preferred_term: esophagus
    term:
      id: UBERON:0001043
      label: esophagus
- name: Salivary Acinar Enlargement
  description: Vomiting-associated sialadenosis consists of non-inflammatory acinar hypertrophy, usually involving both parotid glands. The precise trigger is uncertain; it must not be equated with inflammatory sialadenitis. Serum amylase elevation may be salivary rather than pancreatic.
  biological_scale: TISSUE
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Pathology study reveals hypertrophied acinar cells with otherwise preserved architecture without evidence of inflammation.
    explanation: Describes salivary tissue pathology.
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Isoenzyme studies further demonstrate that the elevations in serum amylase originate from salivary glands as opposed to the pancreas
    explanation: Supports the salivary origin of hyperamylasemia in the studied purging population.
  downstream:
  - target: Parotid Gland Enlargement
    description: Acinar hypertrophy manifests as gland enlargement.
    causal_link_type: DIRECT
  - target: Hyperamylasemia
    description: Salivary amylase can contribute to increased circulating total amylase.
    causal_link_type: DIRECT
  locations:
  - preferred_term: parotid gland
    term:
      id: UBERON:0001831
      label: parotid gland
- name: Purging-Related Volume and Electrolyte Loss
  description: Purging can cause loss of sodium chloride, water and potassium. The pattern depends on vomiting, diuretic use or laxative-induced diarrhea and on frequency. Normal electrolytes in intermittent purging do not exclude BN.
  biological_scale: ORGANISM
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Repeated episodes of vomiting can lead to dehydration and subsequent upregulation of the secretion of the renin-angiotensin-aldosterone steroid hormone system.
    explanation: Connects volume depletion to compensatory hormonal activation.
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The majority of patients with bulimia, who vomit only occasionally, will have normal serum electrolytes
    explanation: Explains why normal laboratory findings do not exclude the syndrome.
  downstream:
  - target: Dehydration
    description: Fluid loss can cause dehydration.
    causal_link_type: DIRECT
  - target: Hypochloremia
    description: Gastric or other purging-related losses can reduce chloride.
    causal_link_type: DIRECT
  - target: Hyponatremia
    description: Sodium and fluid disturbances can produce hyponatremia.
    causal_link_type: DIRECT
  - target: Orthostatic Hypotension
    description: Reduced circulating volume can cause orthostatic symptoms.
    causal_link_type: DIRECT
  - target: Secondary Hyperaldosteronism and Renal Potassium Loss
    description: Volume depletion activates the renin-angiotensin-aldosterone system.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - Reduced renal perfusion and increased renin/angiotensin signaling
- name: Secondary Hyperaldosteronism and Renal Potassium Loss
  description: Volume depletion activates renin-angiotensin-aldosterone signaling. Aldosterone promotes sodium retention at the expense of renal potassium and hydrogen loss. Vomiting-related acid loss, volume contraction and renal bicarbonate retention sustain hypokalemic metabolic alkalosis. Renal potassium loss can exceed the direct gastrointestinal loss.
  biological_scale: TISSUE
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Aldosterone also promotes renal secretion of potassium into the urine and thus hypokalemia.
    explanation: Defines a key renal mechanism.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: This mechanism of potassium loss is actually a larger contributor to the hypokalemia than the actual gastrointestinal or urinary loses from the behaviors themselves.
    explanation: Distinguishes secondary renal loss from direct loss.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Intravascular volume depletion resulting from the loss of sodium chloride increases the resorption of bicarbonate within the proximal renal tubule, preventing its loss in the urine
    explanation: Explains maintenance of alkalosis.
  downstream:
  - target: Hypokalemia
    description: Renal potassium wasting contributes to hypokalemia.
    causal_link_type: DIRECT
  - target: Metabolic Alkalosis
    description: Acid loss and renal retention of bicarbonate sustain alkalosis.
    causal_link_type: DIRECT
  - target: Hypokalemia-Related Cardiac Electrical Instability
    description: Potassium depletion can disturb cardiac repolarization.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - Hypokalemia
  - target: Post-Purging Sodium and Water Retention
    description: Persistent aldosterone activity can cause fluid retention when ongoing losses cease.
    causal_link_type: DIRECT
  locations:
  - preferred_term: kidney
    term:
      id: UBERON:0002113
      label: kidney
- name: Hypokalemia-Related Cardiac Electrical Instability
  description: Purging-related hypokalemia and acid-base disturbance can prolong repolarization and predispose to serious ventricular arrhythmias, including torsades de pointes. These are secondary medical complications, not a defining inherited long-QT syndrome.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The resultant hypokalaemia can result in a prolonged QTc interval putting the patient at risk for significant arrhythmias resulting in syncope and palpitations.
    explanation: Links potassium disturbance to cardiac electrical risk.
  downstream:
  - target: Prolonged QTc Interval
    description: Hypokalemia can prolong corrected QT.
    causal_link_type: DIRECT
  - target: Cardiac Arrhythmia
    description: Electrical instability can produce arrhythmia.
    causal_link_type: DIRECT
  - target: Syncope
    description: Arrhythmia or hemodynamic compromise can cause syncope.
    causal_link_type: DIRECT
  locations:
  - preferred_term: heart
    term:
      id: UBERON:0000948
      label: heart
- name: Post-Purging Sodium and Water Retention
  description: In pseudo-Bartter physiology, aldosterone remains elevated after purging stops. Continued renal sodium retention without ongoing fluid loss can produce rapid edema and distressing weight gain, especially with rapid saline administration. This is acquired physiology, not inherited Bartter syndrome.
  biological_scale: ORGANISM
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The reason is that the serum aldosterone levels remain high, causing salt and water retention even though the patient is no longer losing fluid, as the purging has ceased.
    explanation: Explains edema after cessation.
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: can result in severe peripheral edema formation especially if the patient with bulimia is given intravenous saline-containing fluids in a rapid manner
    explanation: Documents the fluid-treatment interaction.
  downstream:
  - target: Peripheral Edema
    description: Retained sodium and water cause edema.
    causal_link_type: DIRECT
- name: Laxative-Related Bicarbonate Loss
  description: Acute laxative-induced diarrhea removes bicarbonate and can cause normal-anion-gap metabolic acidosis. Chronic diarrhea with pronounced volume depletion can instead produce secondary hyperaldosteronism and alkalosis; not every purging method produces the same acid-base pattern.
  biological_scale: TISSUE
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Electrolytes lost through laxative use include chloride, calcium, bicarbonate, and potassium.
    explanation: Identifies direct losses.
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: acute diarrhea of shorter duration results in a hyperchloremic metabolic acidosis
    explanation: Supports the acidosis pathway.
  downstream:
  - target: Metabolic Acidosis
    description: Fecal bicarbonate loss can produce hyperchloremic acidosis.
    causal_link_type: DIRECT
phenotypes:
- name: Bulimic Eating Behavior
  description: Recurrent binge eating with compensatory behavior is the defining pattern. The HPO term captures the combined behavioral phenotype, rather than binge eating in isolation.
  phenotype_term:
    preferred_term: Bulimia
    term:
      id: HP:0100739
      label: Bulimia
  evidence:
  - reference: PMID:42532999
    reference_title: Bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: its cardinal feature is recurrent binge eating followed by extreme weight control or compensatory behaviours
    explanation: Contemporary synthesis supports the combined phenotype.
- name: Vomiting
  description: Self-induced vomiting is a common compensatory method but is not required in every BN presentation.
  phenotype_term:
    preferred_term: Vomiting
    term:
      id: HP:0002013
      label: Vomiting
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Self-induced vomiting is the most frequently used purging method
    explanation: Supports vomiting while allowing other methods.
- name: Hypokalemia
  description: Purging-related hypokalemia may be clinically silent or life-threatening. Frequency depends on setting and behavior; it occurred in 6.8% of otherwise healthy outpatient women in one controlled study.
  phenotype_term:
    preferred_term: Hypokalemia
    term:
      id: HP:0002900
      label: Hypokalemia
  evidence:
  - &id001
    reference: PMID:11746288
    reference_title: "Laboratory screening for electrolyte abnormalities and anemia in bulimia nervosa: a controlled study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: patients showed more frequent occurrence of low values for serum potassium (6.8% vs. 0.9%; p <.05) and chloride (8.1% vs. 0.9%; p <.02).
    explanation: Study of 74 otherwise healthy, medication-free, normal-weight outpatient women with purging BN; these rates are not universal.
- name: Hypochloremia
  description: Low chloride can accompany vomiting or other purging losses; 8.1% of women in the selected outpatient study had low serum chloride.
  phenotype_term:
    preferred_term: Hypochloremia
    term:
      id: HP:0003113
      label: Hypochloremia
  evidence:
  - *id001
- name: Metabolic Alkalosis
  description: Vomiting and volume-depleting diuretic misuse can produce hypochloremic, hypokalemic metabolic alkalosis; chronic laxative-associated volume depletion may do likewise.
  phenotype_term:
    preferred_term: Metabolic alkalosis
    term:
      id: HP:0200114
      label: Metabolic alkalosis
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Patients with self-induced vomiting or diuretic abuse, or both, have been shown to present with hypokalemia, hypochloremia, and a metabolic alkalosis.
    explanation: Identifies the clinical biochemical pattern.
- name: Metabolic Acidosis
  description: Shorter-duration laxative-induced diarrhea may produce hyperchloremic metabolic acidosis rather than alkalosis.
  phenotype_term:
    preferred_term: Metabolic acidosis
    term:
      id: HP:0001942
      label: Metabolic acidosis
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: acute diarrhea of shorter duration results in a hyperchloremic metabolic acidosis
    explanation: Supports the method-specific complication.
- name: Hyponatremia
  description: Hyponatremia can accompany purging-related fluid and sodium disturbance; it is not an obligatory finding.
  phenotype_term:
    preferred_term: Hyponatremia
    term:
      id: HP:0002902
      label: Hyponatremia
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Hyponatremia can also be present with these 3 purging behaviors.
    explanation: Clinical synthesis describes a possible complication.
- name: Dehydration
  description: Vomiting, laxative misuse or diuretic misuse can cause fluid depletion.
  phenotype_term:
    preferred_term: Dehydration
    term:
      id: HP:0001944
      label: Dehydration
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Repeated episodes of vomiting can lead to dehydration
    explanation: Supports dehydration.
- name: Orthostatic Hypotension
  description: Volume depletion may cause orthostatic hypotension and presyncope.
  phenotype_term:
    preferred_term: Orthostatic hypotension
    term:
      id: HP:0001278
      label: Orthostatic hypotension
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Dehydration as a result of repeated episodes of emesis can result in both resting and exertional sinus tachycardia, hypotension, and orthostasis.
    explanation: Supports hemodynamic complications.
- name: Prolonged QTc Interval
  description: Acquired QTc prolongation can develop with hypokalemia; it is not universal or evidence for congenital long-QT disease.
  phenotype_term:
    preferred_term: Prolonged QTc interval
    term:
      id: HP:0005184
      label: Prolonged QTc interval
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The resultant hypokalaemia can result in a prolonged QTc interval
    explanation: Supports the acquired ECG abnormality.
- name: Cardiac Arrhythmia
  description: Electrolyte disturbance can produce clinically important arrhythmias, including torsades de pointes in severe hypokalemia.
  phenotype_term:
    preferred_term: Arrhythmia
    term:
      id: HP:0011675
      label: Arrhythmia
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The most severe of these is a specific type of ventricular tachycardia known as torsades de pointes that can be fatal
    explanation: Documents a severe arrhythmic complication.
- name: Syncope
  description: Syncope may occur with arrhythmia or marked hemodynamic disturbance.
  phenotype_term:
    preferred_term: Syncope
    term:
      id: HP:0001279
      label: Syncope
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: significant arrhythmias resulting in syncope and palpitations
    explanation: Supports syncope as a complication.
- name: Peripheral Edema
  description: Rapid edema can follow purging cessation because secondary aldosterone elevation persists, especially if fluid replacement is excessive.
  phenotype_term:
    preferred_term: Edema
    term:
      id: HP:0000969
      label: Edema
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: can result in severe peripheral edema formation especially if the patient with bulimia is given intravenous saline-containing fluids in a rapid manner
    explanation: Supports the conditional edema phenotype.
- name: Dental Erosion
  description: Acquired enamel erosion, often on lingual maxillary surfaces, follows acid exposure during vomiting. The broader HPO enamel-morphology term is used because a specific dental-erosion term was not found; developmental enamel hypoplasia would misrepresent this acquired process.
  phenotype_term:
    preferred_term: Dental erosion
    term:
      id: HP:0000682
      label: Abnormal dental enamel morphology
    coarse_binding_basis: NO_HPO_TERM
    term_gap: HPO searches for dental erosion and enamel erosion found no dedicated acquired-erosion term. Abnormal dental enamel morphology is the closest broader binding; developmental enamel hypoplasia would assert a different process. No term request has been filed.
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Dental erosions typically occur on the lingual surface of the maxillary teeth.
    explanation: Defines the distribution of erosion.
  - reference: PMID:28972588
    reference_title: "The impact of bulimia nervosa on oral health: A review of the literature."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: While there is consensus that bulimic behaviour directly causes dental erosion due to vomiting and acidic food choices, there is less clear evidence for a direct link between bulimia nervosa and dental caries
    explanation: Supports erosion and limits extrapolation to caries.
- name: Parotid Gland Enlargement
  description: Usually bilateral non-inflammatory sialadenosis can accompany recurrent vomiting and may become conspicuous after cessation.
  phenotype_term:
    preferred_term: Enlargement of parotid gland
    term:
      id: HP:0011801
      label: Enlargement of parotid gland
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The bilateral parotid glands are the glands most commonly involved, but submandibular enlargement may also be seen
    explanation: Specifies the glands involved.
- name: Hyperamylasemia
  description: Elevated serum amylase can originate from salivary glands in purging presentations; total amylase elevation alone does not establish pancreatitis.
  phenotype_term:
    preferred_term: Hyperamylasemia
    term:
      id: HP:0410288
      label: Hyperamylasemia
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Isoenzyme studies further demonstrate that the elevations in serum amylase originate from salivary glands as opposed to the pancreas
    explanation: Supports salivary hyperamylasemia.
- name: Gastroesophageal Reflux
  description: Reflux symptoms are reported in vomiting presentations. Symptom severity and endoscopic injury may be discordant.
  phenotype_term:
    preferred_term: Gastroesophageal reflux
    term:
      id: HP:0002020
      label: Gastroesophageal reflux
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Patients who induce vomiting will commonly complain of symptoms consistent with gastroesophageal reflux (GERD), dysphagia, and odynophagia
    explanation: Supports symptomatic reflux.
- name: Esophagitis
  description: Repeated vomiting can produce esophagitis, although endoscopic findings are often normal or mild.
  phenotype_term:
    preferred_term: Esophagitis
    term:
      id: HP:0100633
      label: Esophagitis
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: endoscopic evaluation is generally normal or only demonstrates mild esophagitis
    explanation: Keeps the structural finding proportional to the clinical evidence.
- name: Hematemesis
  description: Mallory-Weiss tears after repeated retching can cause blood-streaked vomitus; this is a complication rather than a defining feature.
  phenotype_term:
    preferred_term: Hematemesis
    term:
      id: HP:0002248
      label: Hematemesis
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Mallory-Weiss tears commonly present as blood-streaked or tinged emesis or scant coffee ground emesis following recurrent vomiting episodes.
    explanation: Supports the bleeding manifestation.
- name: Constipation
  description: Constipation may occur during withdrawal from chronic laxative misuse. Permanent cathartic-colon injury with currently used stimulant laxatives remains uncertain.
  phenotype_term:
    preferred_term: Constipation
    term:
      id: HP:0002019
      label: Constipation
  evidence:
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: A history of prolonged laxative use may also produce a more innocuous reflex constipation.
    explanation: Supports rebound constipation.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: it is currently speculative as to whether this condition truly develops in those with eating disorders and with use of currently available stimulant laxatives.
    explanation: Limits the stronger historical claim about cathartic colon.
- name: Irregular Menstruation
  description: Menstrual irregularity is a possible associated feature; amenorrhea is not a BN diagnostic requirement.
  phenotype_term:
    preferred_term: Irregular menstruation
    term:
      id: HP:0000858
      label: Irregular menstruation
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: A potential endocrine complication of BN is irregular menses
    explanation: Supports the specific menstrual phenotype.
- name: Depressive Symptoms
  description: Depression is an important comorbidity and treatment consideration, not a required feature of BN.
  phenotype_term:
    preferred_term: Depression
    term:
      id: HP:0000716
      label: Depression
  evidence:
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Significant comorbidity was found between bulimia and anorexia nervosa, alcoholism, panic disorder, generalized anxiety disorder, phobia, and major depression.
    explanation: Population-based clinical study supports comorbidity.
- name: Anxiety
  description: Anxiety disorders commonly co-occur with BN. The cited cross-sectional comorbidity evidence does not establish which disorder began first.
  phenotype_term:
    preferred_term: Anxiety
    term:
      id: HP:0000739
      label: Anxiety
  evidence:
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Significant comorbidity was found between bulimia and anorexia nervosa, alcoholism, panic disorder, generalized anxiety disorder, phobia, and major depression.
    explanation: Supports comorbidity without an onset-order claim.
- name: Impulsivity
  description: Eating-related disinhibition can occur; generalized trait impulsivity is heterogeneous and must not be treated as universal. In a selected BN feasibility sample excluding ADHD, baseline general impulsivity was not elevated relative to clinical norms.
  phenotype_term:
    preferred_term: Impulsivity
    term:
      id: HP:0100710
      label: Impulsivity
  evidence:
  - reference: PMID:37218020
    reference_title: Secondary outcomes and qualitative findings of an open-label feasibility trial of lisdexamfetamine dimesylate for adults with bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: The average TFEQ Disinhibition score was clinically elevated at baseline
    explanation: Supports eating-specific disinhibition in this selected sample.
  - reference: PMID:37218020
    reference_title: Secondary outcomes and qualitative findings of an open-label feasibility trial of lisdexamfetamine dimesylate for adults with bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: the BIS-11 impulsivity scales were not elevated at baseline relative to clinical norms
    explanation: Limits the generalized-trait claim.
genetic:
- name: Complex polygenic liability
  association: Risk Factor
  notes: The 1991 female twin study estimated liability heritability at 55%. A 2025 Danish/Swedish register study estimated BN heritability at 0.39 (95% CI 0.32–0.46). These estimates depend on study design and ascertainment; they are not penetrance or individual predictions. The register study did not account for shared environmental effects and did not identify causal genes. A 2026 GWAS of broadly defined binge-eating behavior includes BN, BED and symptom-level cases; its six loci are not BN-specific Mendelian causes.
  evidence:
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: The best-fitting model indicated that familial aggregation was due solely to genetic factors with a heritability of liability of 55%.
    explanation: Model-based estimate in the historic female twin cohort.
  - reference: DOI:10.1038/s41467-025-61496-5
    reference_title: "Shared genetic architecture between eating disorders, mental health conditions, and cardiometabolic diseases: a comprehensive population-wide study across two countries"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: 'BN as 0.39 (95% CI: 0.32– 0.46)'
    explanation: BN-specific estimate from the published register study, replacing the earlier preprint.
  - reference: DOI:10.1038/s41467-025-61496-5
    reference_title: "Shared genetic architecture between eating disorders, mental health conditions, and cardiometabolic diseases: a comprehensive population-wide study across two countries"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: We did not account for the inﬂuence of shared environmental factors among close relatives on heritability and genetic correlation estimates.
    explanation: The full-text limitation constrains causal and quantitative interpretation.
  - reference: DOI:10.1038/s44220-026-00698-2
    reference_title: Genomic meta-analyses of binge-eating behavior and anorexia nervosa yield insights into the unique and shared biology of eating disorder phenotypes
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: We identified six BE-associated loci, including loci associated with a higher body mass index and impulse-control behaviors.
    explanation: Indirect evidence from a broad transdiagnostic binge-eating phenotype, not a dedicated BN locus analysis.
    directness: INDIRECT
treatments:
- name: Eating-Disorder-Focused Cognitive Behavioral Therapy
  description: CBT addresses regular eating, rigid dietary rules, overvaluation of shape and weight, emotional triggers and relapse prevention. NICE recommends individual CBT when guided self-help is unsuitable or ineffective; APA recommends eating-disorder-focused CBT for adults together with a serotonin reuptake inhibitor. Medication should not be the sole treatment.
  treatment_term:
    preferred_term: Cognitive Behavior Therapy
    term:
      id: NCIT:C64345
      label: Cognitive Behavior Therapy
  therapeutic_modality: BEHAVIORAL
  evidence:
  - reference: PMID:17370288
    reference_title: "Bulimia nervosa treatment: a systematic review of randomized controlled trials."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Cognitive behavioral therapy reduces core behavioral and psychological features in the short and long term.
    explanation: Systematic review supports CBT efficacy.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: follow by addressing the eating disorder psychopathology (for example, the extreme dietary restraint, the concerns about body shape and weight, and the tendency to binge eat in response to difficult thoughts and feelings)
    explanation: Specifies CBT targets.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Do not offer medication as the sole treatment for bulimia nervosa.
    explanation: Psychological care remains central.
  target_mechanisms:
  - target: Shape and Weight Overvaluation with Dietary Restraint
    treatment_effect: MODULATES
    description: CBT addresses rigid eating rules and shape/weight concerns.
  - target: Negative Affect Around Binge Episodes
    treatment_effect: MODULATES
    description: CBT develops responses to difficult thoughts and feelings that can trigger binge eating.
- name: Guided Cognitive Behavioral Self-Help
  description: NICE advises considering BN-focused guided self-help for adults, using structured cognitive behavioral materials with brief supportive sessions. Assess response and consider individual CBT if it is unacceptable, contraindicated or ineffective after four weeks.
  treatment_term:
    preferred_term: Cognitive Behavior Therapy
    term:
      id: NCIT:C64345
      label: Cognitive Behavior Therapy
  therapeutic_modality: BEHAVIORAL
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Consider bulimia-nervosa-focused guided self-help for adults with bulimia nervosa.
    explanation: Adult guided self-help recommendation.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: use cognitive behavioural self-help materials for eating disorders
    explanation: Specifies the intervention content.
- name: Family-Based Treatment for Adolescents
  description: Family-based treatment collaboratively supports regular eating and reduction of compensatory behaviors without blaming families. In a randomized trial of adolescents with full or partial BN, FBT-BN yielded higher abstinence than adolescent CBT at end of treatment and six months, but the difference was not significant at twelve months. Missing follow-up and specialized settings limit generalization. Individual CBT is an alternative when family treatment is unsuitable or ineffective.
  treatment_term:
    preferred_term: Family Therapy
    term:
      id: NCIT:C93347
      label: Family Therapy
  therapeutic_modality: BEHAVIORAL
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: use a collaborative approach between the parents and the young person to establish regular eating patterns and minimise compensatory behaviours
    explanation: Family involvement is collaborative, not an assertion of family causation.
  - reference: PMID:26506579
    reference_title: Randomized Clinical Trial of Family-Based Treatment and Cognitive-Behavioral Therapy for Adolescent Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Participants in FBT-BN achieved higher abstinence rates than in CBT-A at end of treatment (39% versus 20%; p = .040, number needed to treat [NNT] = 5) and at 6-month follow-up (44% versus 25%; p = .030, NNT = 5).
    explanation: Randomized comparison; full text identifies 109 participants in these two arms of a three-arm study.
  - reference: PMID:26506579
    reference_title: Randomized Clinical Trial of Family-Based Treatment and Cognitive-Behavioral Therapy for Adolescent Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Abstinence rates between these 2 groups did not differ statistically at 12-month follow-up
    explanation: The longer follow-up does not establish sustained comparative superiority.
  target_mechanisms:
  - target: Compensatory Behaviors
    treatment_effect: MODULATES
    description: Family-supported behavior change aims to reduce compensation.
  - target: Loss-of-Control Binge Eating
    treatment_effect: MODULATES
    description: Supported regular eating aims to interrupt recurrent binge episodes.
- name: Fluoxetine Pharmacotherapy
  description: Fluoxetine 60 mg/day has placebo-controlled evidence for reducing binge and vomiting frequency in adults. APA recommends a serotonin reuptake inhibitor with CBT initially or after minimal response to psychotherapy by six weeks. Treatment response does not demonstrate a primary serotonin deficiency. Insomnia, nausea, asthenia and tremor occurred more often than with placebo in the founding trial.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: fluoxetine
      term:
        id: CHEBI:5118
        label: fluoxetine
  therapeutic_modality: SMALL_MOLECULE
  evidence:
  - reference: PMID:1550466
    reference_title: "Fluoxetine in the treatment of bulimia nervosa. A multicenter, placebo-controlled, double-blind trial. Fluoxetine Bulimia Nervosa Collaborative Study Group."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Fluoxetine at 60 mg/d proved superior to placebo in decreasing the frequency of weekly binge-eating and vomiting episodes at end point.
    explanation: Eight-week randomized trial of 387 outpatient women, comparing 60 mg, 20 mg and placebo.
  - reference: url:https://www.guidelinecentral.com/guideline/1971974/pocket-guide/2441963/
    reference_title: APA Treatment of Patients With Eating Disorders Guideline Pocket Guide - Guideline Central
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: either initially or if there is minimal or no response to psychotherapy alone by 6 weeks of treatment.
    explanation: The final APA 2023 recommendation combines medication with eating-disorder-focused CBT.
  - reference: PMID:1550466
    reference_title: "Fluoxetine in the treatment of bulimia nervosa. A multicenter, placebo-controlled, double-blind trial. Fluoxetine Bulimia Nervosa Collaborative Study Group."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: Several adverse events (ie, insomnia, nausea, asthenia, and tremor) occurred significantly more frequently with fluoxetine (60 or 20 mg/d) than with placebo.
    explanation: Trial adverse effects; discontinuation due to adverse events did not differ significantly.
  target_mechanisms:
  - target: Loss-of-Control Binge Eating
    treatment_effect: MODULATES
    description: Fluoxetine can reduce binge frequency; the disease-level molecular mechanism remains uncertain.
  - target: Compensatory Behaviors
    treatment_effect: MODULATES
    description: Randomized evidence supports reduced vomiting frequency.
- name: Off-Label Topiramate
  description: Topiramate has randomized short-term efficacy evidence and is recommended in the 2023 WFSBP pharmacological guideline, but has no eating-disorder marketing authorization. In a 69-person trial with 64 included in the intention-to-treat analysis, weekly binge/purge days decreased more than with placebo; not every secondary endpoint was significant. Specialist assessment of tolerability and individual risks is required.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: topiramate
      term:
        id: CHEBI:63631
        label: topiramate
  therapeutic_modality: SMALL_MOLECULE
  evidence:
  - reference: PMID:14658948
    reference_title: "Treatment of bulimia nervosa with topiramate in a randomized, double-blind, placebo-controlled trial, part 1: improvement in binge and purge measures."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: The primary efficacy measure, mean weekly number of binge and/or purge days, decreased 44.8% from baseline with topiramate versus 10.7% with placebo (p =.004).
    explanation: Ten-week randomized trial; this is change in days, not a remission rate.
  - reference: PMID:37350265
    reference_title: World Federation of Societies of Biological Psychiatry (WFSBP) guidelines update 2023 on the pharmacological treatment of eating disorders.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Despite the published evidence, olanzapine and topiramate have not received marketing authorisation for use in EDs from any medicine regulatory agency.
    explanation: Guideline separates evidence from regulatory authorization.
  target_mechanisms:
  - target: Loss-of-Control Binge Eating
    treatment_effect: MODULATES
    description: Short-term trial evidence supports reduction in binge/purge days.
- name: Medical Stabilization and Electrolyte Replacement
  description: Assess fluid and electrolyte balance and ECG risk in purging presentations. Severe electrolyte imbalance, dehydration or impending organ failure requires urgent medical care. Replace potassium and correct volume depletion under monitoring; oral replacement is preferred when the disturbance is not severe and absorption is adequate. Rapid fluid replacement can worsen pseudo-Bartter edema.
  treatment_term:
    preferred_term: Therapeutic Procedure
    term:
      id: NCIT:C49236
      label: Therapeutic Procedure
    therapeutic_agent:
    - preferred_term: potassium chloride
      term:
        id: CHEBI:32588
        label: potassium chloride
  therapeutic_modality: OTHER
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Provide acute medical care (including emergency admission) for people with an eating disorder who have severe electrolyte imbalance, severe malnutrition, severe dehydration or signs of incipient organ failure.
    explanation: Defines acute escalation indications.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: For people with an eating disorder who need supplements to restore electrolyte balance, offer these orally unless the person has problems with gastrointestinal absorption or the electrolyte disturbance is severe.
    explanation: Replacement route depends on clinical severity.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Correcting the patient’s volume depletion is required to correct the metabolic alkalosis and interrupt renin-angiotensin-aldosterone system activation.
    explanation: Volume and potassium deficits must be treated together.
  target_mechanisms:
  - target: Purging-Related Volume and Electrolyte Loss
    treatment_effect: MODULATES
    description: Monitored replacement restores volume and electrolytes.
  - target: Secondary Hyperaldosteronism and Renal Potassium Loss
    treatment_effect: MODULATES
    description: Correction of depletion reduces ongoing aldosterone-driven loss.
- name: Management of Post-Purging Edema
  description: Explain pseudo-Bartter fluid retention when purging stops and monitor fluid balance. The clinical review describes judicious fluid replacement and short-term spironolactone in selected patients to counter persistent aldosterone activity. This is supervised treatment of acquired physiology, not use of diuretics for weight control.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: spironolactone
      term:
        id: CHEBI:9241
        label: spironolactone
  therapeutic_modality: SMALL_MOLECULE
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The reason is that the serum aldosterone levels remain high, causing salt and water retention even though the patient is no longer losing fluid, as the purging has ceased.
    explanation: Defines the physiology that management addresses.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Spironolactone is generally continued for 2 to 4 weeks and then should be tapered by 50 mg every few days thereafter.
    explanation: Clinical review describes a short, monitored course for pseudo-Bartter edema.
  target_mechanisms:
  - target: Post-Purging Sodium and Water Retention
    treatment_effect: MODULATES
    description: Selected short-term aldosterone blockade can reduce post-purging fluid retention.
- name: Dental Care and Acid-Exposure Reduction
  description: Arrange regular dental assessment and treatment of erosive injury. After vomiting, avoid immediate tooth brushing and use a non-acid rinse; avoid highly acidic food and drinks. Established enamel loss is irreversible, so behavioral recovery does not itself restore lost enamel.
  treatment_term:
    preferred_term: Dental Procedure
    term:
      id: NCIT:C38052
      label: Dental Procedure
  therapeutic_modality: OTHER
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: avoid brushing teeth immediately after vomiting
    explanation: Reduces abrasion of acid-softened enamel.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: rinse with non‑acid mouthwash after vomiting
    explanation: Guideline oral-care advice.
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Dental erosions are irreversible once they have developed.
    explanation: Distinguishes prevention of further injury from reversal of existing enamel loss.
  target_mechanisms:
  - target: Gastric Acid Exposure and Mucosal Injury
    treatment_effect: MODULATES
    description: Oral care and reduced acid exposure limit additional dental injury.
- name: Regular Eating and Cessation of Compensatory Behaviors
  description: Establish regular meals within psychological treatment, with nutritional support as needed. Explain that laxatives and diuretics do not prevent calorie absorption; reduce and stop misuse with clinical support, and stop excessive exercise. Weight loss is not the purpose of BN treatment.
  treatment_term:
    preferred_term: Therapeutic Procedure
    term:
      id: NCIT:C49236
      label: Therapeutic Procedure
  therapeutic_modality: BEHAVIORAL
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: establishing a pattern of regular eating, and providing encouragement, advice and support while people do this
    explanation: Core early CBT intervention.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: that laxatives and diuretics do not reduce calorie absorption and so do not help with weight loss
    explanation: Corrects the rationale sustaining misuse.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: to gradually reduce and stop laxative or diuretic use
    explanation: Cessation should be supported and monitored.
  target_mechanisms:
  - target: Shape and Weight Overvaluation with Dietary Restraint
    treatment_effect: MODULATES
    description: Regular eating reduces extreme restraint and irregular intake.
  - target: Compensatory Behaviors
    treatment_effect: MODULATES
    description: Supported cessation reduces purging-related medical injury.
- name: Medication Safety Review
  description: Review medications in the context of electrolyte disturbance, cardiac risk and comorbid psychiatric needs. Bupropion is contraindicated with a current or prior diagnosis of bulimia nervosa because of increased seizure risk; it must not be generalized from a list of antidepressants studied in eating disorders.
  treatment_term:
    preferred_term: Therapeutic Procedure
    term:
      id: NCIT:C49236
      label: Therapeutic Procedure
  therapeutic_modality: OTHER
  evidence:
  - reference: url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=bcb4ef83-f272-4090-8547-9aaf4ab63667
    reference_title: "DailyMed - BUPROPION HYDROCHLORIDE tablet, film coated"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Bupropion hydrochloride tablets are contraindicated in patients with a current or prior diagnosis of bulimia or anorexia nervosa as a higher incidence of seizures was observed in such patients treated with bupropion hydrochloride tablets
    explanation: Current drug-label contraindication; this supports avoidance, not administration.
- name: Conditional Digital Guided Self-Help
  description: NICE HTG768 (January 2026) permits Overcoming Bulimia Online during a two-year evidence-generation period in the NHS for selected adults after clinical assessment and with usual physical monitoring and waiting-list support. This conditional recommendation does not establish equivalence of all apps or suitability for severe illness. Other named technologies remain research-only.
  treatment_term:
    preferred_term: Cognitive Behavior Therapy
    term:
      id: NCIT:C64345
      label: Cognitive Behavior Therapy
  therapeutic_modality: BEHAVIORAL
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/htg768/chapter/1-Recommendations
    reference_title: "1 Recommendations | Digital self-help for eating disorders: early value assessment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: 'Overcoming Bulimia Online can be used in the NHS during the evidence generation period as an option to treat the following conditions in adults:'
    explanation: Conditional early-value recommendation, subject to the guidance safeguards.
- name: Investigational Lisdexamfetamine
  description: Lisdexamfetamine remains investigational for BN. An uncontrolled eight-week study enrolled 23 participants, with 18 completing per protocol, and reported symptom reductions alongside mean heart-rate increase of 12.1 beats/min and weight loss of 2.1 kg; one participant was withdrawn for substantial weight loss. Secondary analyses are from the same cohort. These findings and the BED indication do not establish BN efficacy or support routine prescribing.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: lisdexamfetamine
      term:
        id: CHEBI:135925
        label: lisdexamfetamine
  therapeutic_modality: SMALL_MOLECULE
  evidence:
  - reference: PMID:33534199
    reference_title: A feasibility study evaluating lisdexamfetamine dimesylate for the treatment of adults with bulimia nervosa.
    supports: NO_EVIDENCE
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: However, the results should not be used as evidence for clinicians to prescribe LDX to individuals with BN before its efficacy and safety are properly tested.
    explanation: The primary investigators explicitly limit clinical translation.
  - reference: PMID:39137484
    reference_title: "Stimulant medications in the management of bulimia nervosa and anorexia nervosa in patients with and without comorbid attention deficit hyperactivity disorder: A systematic review."
    supports: NO_EVIDENCE
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: There is currently insufficient evidence to support the use of stimulant medications to treat symptoms of BN or AN.
    explanation: The systematic review does not support routine stimulant treatment.
  - reference: PMID:33534199
    reference_title: A feasibility study evaluating lisdexamfetamine dimesylate for the treatment of adults with bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: There was a mean weight reduction of 2.1 kg and one participant was withdrawn for clinically significant weight loss.
    explanation: Supports the observed weight-loss safety caveat, not efficacy or routine prescribing.
- name: Comorbidity and Crisis Care
  description: Coordinate eating-disorder treatment with care for depression, anxiety, substance use and other comorbid conditions. Acute suicide or other mental-health risk can require crisis or inpatient psychiatric care. The order and setting of treatment depend on severity, functioning and patient preferences.
  therapeutic_modality: OTHER
  treatment_term:
    preferred_term: Comorbidity and Crisis Care
    term:
      id: NCIT:C49236
      label: Therapeutic Procedure
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Eating disorder specialists and other healthcare teams should collaborate to support effective treatment of physical or mental health comorbidities in people with an eating disorder.
    explanation: Guideline supports coordinated clinical care.
- name: Relapse Prevention
  description: Develop a plan for maintaining regular eating, responding to recurrence of bingeing or compensatory behaviors, and returning to care promptly. Psychological treatment includes relapse-prevention work; long-term cohort recovery does not imply immunity from later relapse.
  therapeutic_modality: BEHAVIORAL
  treatment_term:
    preferred_term: Relapse Prevention
    term:
      id: NCIT:C49236
      label: Therapeutic Procedure
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: towards the end of treatment, spread appointments further apart and focus on maintaining positive changes and minimising the risk of relapse
    explanation: BN-specific CBT recommendation.
prevalence:
- population: Women (population-based female twin register, DSM-III-R narrowly defined)
  measure_type: LIFETIME_PREVALENCE
  prevalence_class: ABOVE_1_IN_1000
  rate_per_100000: 2800.0
  notes: >-
    Historical DSM-III-R estimate in 2,163 female twins; lifetime prevalence was 2.8%, whereas lifetime risk
    was 4.2%. Neither number is a contemporary estimate for all sexes or diagnostic systems.
  evidence:
  - reference: PMID:1842216
    reference_title: The genetic epidemiology of bulimia nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Lifetime prevalence and risk for narrowly defined bulimia were 2.8% and
      4.2%, respectively.
    explanation: >-
      Population-based twin study lifetime prevalence estimate for bulimia
      nervosa in women.
    quote_role: PRIMARY_RESULT
differential_diagnoses:
- name: Anorexia Nervosa
  description: >-
    Anorexia nervosa binge-eating/purging presentations can overlap with
    bulimia nervosa through binge eating and compensatory behaviors.
  distinguishing_features:
  - >-
    Anorexia nervosa requires significantly low body weight or persistent
    restriction leading to low weight; bulimia nervosa does not require low
    body weight and is defined by recurrent binge eating with compensatory
    behaviors.
  disease_term:
    preferred_term: anorexia nervosa
    term:
      id: MONDO:0005351
      label: anorexia nervosa
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: requires episodes of bingeing and compensatory behaviors in BN to occur at least once per week over the course of 3 months and not occur during an episode of anorexia nervosa.
    explanation: The exclusion criterion separates BN from binge/purge symptoms occurring during anorexia nervosa.
- name: Binge Eating Disorder
  description: >-
    Binge eating disorder overlaps with bulimia nervosa through recurrent binge
    eating and loss of control.
  distinguishing_features:
  - >-
    Binge eating disorder lacks regular compensatory behaviors such as
    self-induced vomiting, laxative misuse, fasting, or excessive exercise.
  disease_term:
    preferred_term: binge eating disorder
    term:
      id: MONDO:0005582
      label: binge eating disorder
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: patients with binge-eating disorder tend to be overweight or obese, as they do not purge after binge episodes.
    explanation: The review contrasts binge-eating disorder with BN. Regular compensation is absent in BED; body weight alone is not diagnostic.
diagnosis:
- name: Clinical Diagnostic Assessment
  description: Assess recurrent objectively large binges with loss of control, compensatory behaviors and shape/weight overvaluation. DSM-5 requires bingeing and compensation at least weekly for three months and not exclusively during anorexia nervosa. Do not exclude BN solely because BMI is normal or high.
  diagnosis_term:
    preferred_term: Clinical Evaluation
    term:
      id: NCIT:C124351
      label: Clinical Evaluation
  evidence:
  - reference: url:https://www.ccjm.org/content/88/6/333
    reference_title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: requires episodes of bingeing and compensatory behaviors in BN to occur at least once per week over the course of 3 months and not occur during an episode of anorexia nervosa.
    explanation: Specifies DSM-5 frequency, duration and diagnostic boundary.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Do not use single measures such as BMI or duration of illness to determine whether to offer treatment for an eating disorder.
    explanation: Appearance or a single anthropometric measure cannot determine treatment need.
- name: Medical and Psychiatric Risk Assessment
  description: Review purging methods and frequency, medications, fluid/electrolyte disturbance, vital signs, dental and gastrointestinal symptoms, mood, anxiety, self-harm and suicide risk. Consider ECG monitoring based on purging severity, electrolyte imbalance, symptoms and medication risks. Normal electrolytes in intermittent purging do not exclude the diagnosis.
  diagnosis_term:
    preferred_term: Clinical Evaluation
    term:
      id: NCIT:C124351
      label: Clinical Evaluation
  evidence:
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: Assess fluid and electrolyte balance in people with an eating disorder who are believed to be engaging in compensatory behaviours, such as vomiting, taking laxatives or diuretics, or water loading.
    explanation: Guideline indication for medical assessment.
  - reference: PMID:25866627
    reference_title: Bulimia Nervosa - medical complications.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: The majority of patients with bulimia, who vomit only occasionally, will have normal serum electrolytes
    explanation: A normal test is not a reliable exclusion criterion.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: 'Assess whether ECG monitoring is needed in people with an eating disorder, based on the following risk factors:'
    explanation: Guideline then lists severe purging, electrolyte imbalance, hypotension, medication and rhythm risks; monitoring is risk-based.
  - reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
    reference_title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
    supports: SUPPORT
    evidence_source: OTHER
    quote_role: REVIEW_SYNTHESIS
    snippet: For people with an eating disorder and acute mental health risk (such as significant suicide risk), consider psychiatric crisis care or psychiatric inpatient care.
    explanation: Acute suicide risk requires an appropriate mental-health care response.
  - reference: url:https://www.ncbi.nlm.nih.gov/sites/books/NBK562178/
    reference_title: Bulimia Nervosa - StatPearls - NCBI Bookshelf
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: Patients with bulimia nervosa should be screened for suicidality and comorbid psychiatric illness as they are at higher risk of other mental diseases than the general population.
    explanation: Clinical chapter specifically supports psychiatric-risk assessment in BN.
progression:
- phase: Variable long-term course
  notes: Remission and relapse can occur over many years. In a historic female treatment-seeking cohort, imputed recovery at 22 years was 68.2% among surviving participants with BN. Recovery required minimal symptoms for a year; the study does not demonstrate uninterrupted recovery during the long assessment gap or attribute outcome to a particular treatment. Of 107 BN survivors, 76 were re-interviewed and missing outcomes were imputed.
  evidence:
  - reference: PMID:28002660
    reference_title: Recovery From Anorexia Nervosa and Bulimia Nervosa at 22-Year Follow-Up.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: At 22-year follow-up, 62.8% of participants with anorexia nervosa and 68.2% of participants with bulimia nervosa recovered
    explanation: Diagnosis-specific long-term outcome; the BN figure must not be pooled with the AN figure.
- phase: Mortality and suicide risk
  notes: A 2026 meta-analysis found higher all-cause mortality in BN versus the general population (17 studies; pooled RR 2.39, 95% CI 1.86–3.06; I-squared 55%) and higher suicide-related mortality (RR 6.15, 95% CI 2.52–15.04). These are relative associations from observational cohorts with varying follow-up and ascertainment, not an individual absolute risk or proof that BN alone causes death. The overall review was predominantly female and evidence outside Western countries remained limited. Physical complications and suicide risk require assessment alongside recovery and relapse.
  evidence:
  - reference: PMID:41536100
    reference_title: "All-cause and cause-specific mortality risk in individuals with eating disorders: systematic review and meta-analysis of relative risk and aggravating or attenuating factors."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    directness: DIRECT
    snippet: 'BN (n=17, RR=2.39, 95% CI: 1.86‐3.06, I2=55%, p<0.001).'
    explanation: BN-specific all-cause mortality estimate from the full-text results; do not transfer the higher AN estimate to BN.
  - reference: PMID:41536100
    reference_title: "All-cause and cause-specific mortality risk in individuals with eating disorders: systematic review and meta-analysis of relative risk and aggravating or attenuating factors."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    directness: DIRECT
    snippet: 'RR=6.15, 95% CI: 2.52-15.04 in bulimia nervosa'
    explanation: BN-specific suicide-related mortality estimate, distinct from the pooled eating-disorder result.
animal_models:
- name: Restriction-refeeding rat paradigms
  species: Rat
  description: Food restriction followed by refeeding, sometimes with stress or palatable food, models selected binge-eating components. It does not reproduce the full cognitive, social or compensatory syndrome.
  modeled_mechanisms:
  - target: Loss-of-Control Binge Eating
    relationship: PARTIALLY_RECAPITULATES
    fidelity: LOW
    description: Excessive intake is observed; subjective loss of control and shape/weight overvaluation cannot be inferred.
    evidence:
    - reference: PMID:22138162
      reference_title: "Dysregulation of brain reward systems in eating disorders: neurochemical information from animal models of binge eating, bulimia nervosa, and anorexia nervosa."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      quote_role: REVIEW_SYNTHESIS
      snippet: When they return to a normal body weight and feeding regimen, rats with a history of restriction and refeeding continue to exhibit binge-eating behavior, even when sated.
      explanation: Restriction-refeeding paradigms reproduce aspects of excessive intake, not human body-image cognition or a full BN syndrome.
- name: Gastric sham-feeding rat paradigm
  species: Rat
  description: An open gastric fistula permits intake with little nutrient retention. This probes reward and satiety components but does not model self-induced vomiting, because rats lack an emetic reflex.
  modeled_mechanisms:
  - target: Compensatory Behaviors
    relationship: PARTIALLY_RECAPITULATES
    fidelity: LOW
    description: Gastric drainage mimics loss of ingested contents without the intentional or emetic components of human compensation.
    evidence:
    - reference: PMID:22138162
      reference_title: "Dysregulation of brain reward systems in eating disorders: neurochemical information from animal models of binge eating, bulimia nervosa, and anorexia nervosa."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      quote_role: REVIEW_SYNTHESIS
      snippet: The sham feeding preparation allows for the rat to taste food but retain minimal calories or nutrients, as the food is expelled through a cannula inserted in the stomach or the esophagus
      explanation: Experimental drainage separates oral reward from postingestive feedback; it is not voluntary human vomiting.
clinical_trials:
- name: NCT07542145
  phase: PHASE_I
  status: RECRUITING
  description: Planned 40-person treatment-development study of MDMA-assisted therapy, BN-adapted MDMA-assisted therapy and standard treatment over ten weeks, with six-month follow-up. Experimental; no established BN efficacy.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT07542145
    reference_title: "MDMA Assisted Therapy for Bulimia Nervosa: A Treatment Development Protocol"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: This project will evaluate MDMA Assisted Therapy (MDMA-AT) assisted psychotherapy for the treatment of Bulimia Nervosa (BN) over a 10-week period.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT07581158
  phase: NOT_APPLICABLE
  status: NOT_RECRUITING
  description: Planned 40-person randomized real-versus-sham fNIRS neurofeedback study combined with text-message intervention. Registry status is NOT_YET_RECRUITING, mapped here to NOT_RECRUITING; not evidence of benefit.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT07581158
    reference_title: Understanding and Targeting Self-Regulatory Control in Bulimia Nervosa Via a Combined Real-Time Neurofeedback and Smartphone Intervention
    supports: SUPPORT
    evidence_source: OTHER
    snippet: The purpose of this study is to examine the effects of noninvasive prefrontal cortex (PFC) neurofeedback during eating in women with bulimia nervosa (BN) using wearable brain imaging, functional near-infrared spectroscopy (fNIRS), together with a brain-based 4-week text-messaging intervention.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT05614024
  phase: NOT_APPLICABLE
  status: RECRUITING
  description: Planned 30-person real-versus-sham fNIRS neurofeedback study during eating. No completed efficacy result is claimed.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT05614024
    reference_title: "Neurofeedback During Eating: A Novel Mechanistic Treatment for Bulimia Nervosa"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: The purpose of this study is to examine the effects of noninvasive prefrontal cortex (PFC) neurofeedback during eating in women with bulimia nervosa (BN) using a wearable brain imaging device, functional near-infrared spectroscopy (fNIRS).
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT03397446
  phase: PHASE_II
  status: TERMINATED
  description: Eight-week open-label lisdexamfetamine feasibility study; actual enrollment 23 rather than the planned 30 in its brief summary. Termination reflected COVID-related resource constraints, not a registry determination of toxicity. Published findings do not support routine prescribing.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT03397446
    reference_title: A Feasibility Study to Evaluate Lisdexamfetamine Dimesylate (Vyvanse) in Adults With Bulimia Nervosa
    supports: SUPPORT
    evidence_source: OTHER
    snippet: The relatively high rates of bulimia nervosa (BN) in attention-deficit/hyperactivity disorder (ADHD) cohorts suggest a relationship between the two disorders.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT04225221
  phase: PHASE_II
  status: COMPLETED
  description: 'Ovarian-hormone manipulation study: leuprolide suppression followed by separate estradiol/progesterone add-back in a blinded crossover design. Actual enrollment 10 rather than the 15 planned in the summary; registry results are posted. This is a mechanism study, not established hormonal treatment for BN.'
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT04225221
    reference_title: "Ovarian Hormones, Reward Response, and Binge Eating in Bulimia Nervosa: An Experimental Design"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: This pilot study experimentally manipulates ovarian hormones to examine the direct impact of estrogen (E2) and progesterone (P4) on binge eating symptom burden and the behavioral reward response in women with bulimia nervosa (n=15).
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT06063278
  phase: NOT_APPLICABLE
  status: COMPLETED
  description: Step-by-Step group treatment study with actual enrollment 100 and a nonrandomized controlled waitlist comparison. Follow-up extends to two years; the registry does not provide published efficacy results.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT06063278
    reference_title: "Step by Step Group Therapy for Bulimia Nervosa: Effectiveness and Mechanisms of Change."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: This a pseudo-randomized clinical trial that examines if a specific group therapy for BN is effective in improving its symptomatology, and what variables mediate such improvements.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT05728021
  phase: NOT_APPLICABLE
  status: UNKNOWN
  description: Planned randomized 172-person Recovery Record guided-app aftercare study added to treatment as usual. The registry status is UNKNOWN, so current recruitment or completion is not inferred.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT05728021
    reference_title: "Efficacy of a Therapist-guided Smartphone-based Intervention to Support Recovery From Bulimia Nervosa: a Randomized Controlled Multi-center Trial"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: Inpatient treatment for patients with bulimia nervosa (BN) is recommended in extreme or severe cases and/or after failure of outpatient treatment and is highly effective.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
- name: NCT05995496
  phase: NOT_APPLICABLE
  status: RECRUITING
  description: Planned 150-person basic-mechanism study of fasted/fed neural computations using fMRI and behavioral tasks. This is not a therapeutic efficacy trial.
  notes: Registry status, enrollment and design verified from ClinicalTrials.gov API on 2026-10-01. The cached brief summary describes the protocol and may retain a planned enrollment figure.
  evidence:
  - reference: clinicaltrials:NCT05995496
    reference_title: Dynamic Neural Computations Underlying Cognitive Control in Bulimia Nervosa
    supports: SUPPORT
    evidence_source: OTHER
    snippet: An impaired ability to exert control has been implicated in bulimia nervosa (BN), but this impairment may not represent a stable trait or be the most effective focus for treatment.
    explanation: Registry protocol description; it does not establish efficacy or replace published outcome evidence.
references:
- reference: DOI:10.1038/s41467-025-61496-5
  title: "Shared genetic architecture between eating disorders, mental health conditions, and cardiometabolic diseases: a comprehensive population-wide study across two countries"
  findings: []
- reference: DOI:10.1038/s44220-026-00698-2
  title: Genomic meta-analyses of binge-eating behavior and anorexia nervosa yield insights into the unique and shared biology of eating disorder phenotypes
  findings: []
- reference: PMID:11746288
  title: "Laboratory screening for electrolyte abnormalities and anemia in bulimia nervosa: a controlled study."
  findings: []
- reference: PMID:14658948
  title: "Treatment of bulimia nervosa with topiramate in a randomized, double-blind, placebo-controlled trial, part 1: improvement in binge and purge measures."
  findings: []
- reference: PMID:1550466
  title: "Fluoxetine in the treatment of bulimia nervosa. A multicenter, placebo-controlled, double-blind trial. Fluoxetine Bulimia Nervosa Collaborative Study Group."
  findings: []
- reference: PMID:17370288
  title: "Bulimia nervosa treatment: a systematic review of randomized controlled trials."
  findings: []
- reference: PMID:1842216
  title: The genetic epidemiology of bulimia nervosa.
  findings: []
- reference: PMID:21574678
  title: "Revisiting the affect regulation model of binge eating: a meta-analysis of studies using ecological momentary assessment."
  findings: []
- reference: PMID:22138162
  title: "Dysregulation of brain reward systems in eating disorders: neurochemical information from animal models of binge eating, bulimia nervosa, and anorexia nervosa."
  findings: []
- reference: PMID:25866627
  title: Bulimia Nervosa - medical complications.
  findings: []
- reference: PMID:26506579
  title: Randomized Clinical Trial of Family-Based Treatment and Cognitive-Behavioral Therapy for Adolescent Bulimia Nervosa.
  findings: []
- reference: PMID:28002660
  title: Recovery From Anorexia Nervosa and Bulimia Nervosa at 22-Year Follow-Up.
  findings: []
- reference: PMID:28851137
  title: "Negative affect and binge eating: Reconciling differences between two analytic approaches in ecological momentary assessment research."
  findings: []
- reference: PMID:28972588
  title: "The impact of bulimia nervosa on oral health: A review of the literature."
  findings: []
- reference: PMID:32215560
  title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
  findings: []
- reference: PMID:33534199
  title: A feasibility study evaluating lisdexamfetamine dimesylate for the treatment of adults with bulimia nervosa.
  findings: []
- reference: PMID:37218020
  title: Secondary outcomes and qualitative findings of an open-label feasibility trial of lisdexamfetamine dimesylate for adults with bulimia nervosa.
  findings: []
- reference: PMID:37350265
  title: World Federation of Societies of Biological Psychiatry (WFSBP) guidelines update 2023 on the pharmacological treatment of eating disorders.
  findings: []
- reference: PMID:39137484
  title: "Stimulant medications in the management of bulimia nervosa and anorexia nervosa in patients with and without comorbid attention deficit hyperactivity disorder: A systematic review."
  findings: []
- reference: PMID:42532999
  title: Bulimia nervosa.
  findings: []
- reference: clinicaltrials:NCT03397446
  title: A Feasibility Study to Evaluate Lisdexamfetamine Dimesylate (Vyvanse) in Adults With Bulimia Nervosa
  findings: []
- reference: clinicaltrials:NCT04225221
  title: "Ovarian Hormones, Reward Response, and Binge Eating in Bulimia Nervosa: An Experimental Design"
  findings: []
- reference: clinicaltrials:NCT05614024
  title: "Neurofeedback During Eating: A Novel Mechanistic Treatment for Bulimia Nervosa"
  findings: []
- reference: clinicaltrials:NCT05728021
  title: "Efficacy of a Therapist-guided Smartphone-based Intervention to Support Recovery From Bulimia Nervosa: a Randomized Controlled Multi-center Trial"
  findings: []
- reference: clinicaltrials:NCT05995496
  title: Dynamic Neural Computations Underlying Cognitive Control in Bulimia Nervosa
  findings: []
- reference: clinicaltrials:NCT06063278
  title: "Step by Step Group Therapy for Bulimia Nervosa: Effectiveness and Mechanisms of Change."
  findings: []
- reference: clinicaltrials:NCT07542145
  title: "MDMA Assisted Therapy for Bulimia Nervosa: A Treatment Development Protocol"
  findings: []
- reference: clinicaltrials:NCT07581158
  title: Understanding and Targeting Self-Regulatory Control in Bulimia Nervosa Via a Combined Real-Time Neurofeedback and Smartphone Intervention
  findings: []
- reference: url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=bcb4ef83-f272-4090-8547-9aaf4ab63667
  title: "DailyMed - BUPROPION HYDROCHLORIDE tablet, film coated"
  findings: []
- reference: url:https://www.ccjm.org/content/88/6/333
  title: "Medical complications of bulimia nervosa | Cleveland Clinic Journal of Medicine"
  findings: []
- reference: url:https://www.guidelinecentral.com/guideline/1971974/pocket-guide/2441963/
  title: APA Treatment of Patients With Eating Disorders Guideline Pocket Guide - Guideline Central
  findings: []
- reference: url:https://www.nice.org.uk/guidance/NG69/chapter/recommendations
  title: "Recommendations | Eating disorders: recognition and treatment | Guidance | NICE"
  findings: []
- reference: url:https://www.nice.org.uk/guidance/htg768/chapter/1-Recommendations
  title: "1 Recommendations | Digital self-help for eating disorders: early value assessment | Guidance | NICE"
  findings: []
- reference: PMID:32965849
  title: Bulimia Nervosa.
  findings: []
  tags:
  - StatPearls
- reference: url:https://www.ncbi.nlm.nih.gov/sites/books/NBK562178/
  title: Bulimia Nervosa - StatPearls - NCBI Bookshelf
  findings: []
- reference: DOI:10.1186/s40337-022-00717-4
  title: "Risk factors for eating disorders: findings from a rapid review"
- reference: PMID:41536100
  title: "All-cause and cause-specific mortality risk in individuals with eating disorders: systematic review and meta-analysis of relative risk and aggravating or attenuating factors."
discussions:
- discussion_id: bn-neural-cause-and-consequence
  kind: KNOWLEDGE_GAP
  prompt: Which neural or molecular findings precede and sustain BN?
  rationale: Cross-sectional imaging, treatment response and animal component models do not establish a uniform causal serotonin/dopamine defect. Imaging directions vary, and cause, consequence and disorder specificity remain unresolved.
  evidence:
  - reference: PMID:32215560
    reference_title: Disturbed Resting-State Whole-Brain Functional Connectivity of Striatal Subregions in Bulimia Nervosa.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: the molecular basis of the striatal RSFC changes observed in our study is unclear
    explanation: Primary imaging study explicitly acknowledges the gap.
  attaches_to:
  - pathophysiology#Reward and Inhibitory-Control Circuit Differences
- discussion_id: bn-affect-measurement-timing
  kind: INTERPRETATION
  prompt: Does binge eating reduce negative affect?
  rationale: The 2017 article abstract says pre-binge ratings exceeded post-binge ratings, but the full results and BN table show post-binge ratings higher (26.72 versus 22.63). Pre-binge ratings were also much farther from the episode than post-binge ratings. Declining modeled post-binge trajectories and elevated proximal post-binge ratings can coexist; this does not justify universal immediate relief.
  evidence:
  - reference: PMID:28851137
    reference_title: "Negative affect and binge eating: Reconciling differences between two analytic approaches in ecological momentary assessment research."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: PRIMARY_RESULT
    snippet: The results indicate that post-binge ratings of negative affect were significantly higher than the pre-binge ratings of negative affect for women in both Study 1-AN and Study 2-BN.
    explanation: Use the full-text results and table rather than the reversed abstract statement.
  attaches_to:
  - pathophysiology#Negative Affect Around Binge Episodes
synonyms:
- bulimia
- hyperorexia nervosa
environmental:
- name: Childhood trauma and abuse
  description: Childhood trauma and abuse are nonspecific risk associations for eating disorders, with stronger associations reported for binge/purge presentations. These experiences are neither required nor sufficient for BN, and available observational studies do not establish a single causal pathway.
  disease_effect: PREDISPOSES
  causal_role: RISK_FACTOR
  evidence:
  - reference: DOI:10.1186/s40337-022-00717-4
    reference_title: "Risk factors for eating disorders: findings from a rapid review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    directness: INDIRECT
    snippet: these experiences are more strongly associated with binge-purge type disorders such as BN, BED, and AN-BP
    explanation: The rapid review identifies an association with childhood trauma and abuse across binge/purge diagnoses; it is not a necessary or sufficient cause of BN.
  influences_mechanisms:
  - target: Multifactorial Liability
    environmental_effect: PREDISPOSES
    causal_link_type: UNKNOWN
    description: Associated early adversity contributes to the psychosocial risk context; causal direction and mediating mechanisms remain incompletely resolved.
    evidence:
    - reference: DOI:10.1186/s40337-022-00717-4
      reference_title: "Risk factors for eating disorders: findings from a rapid review"
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      directness: INDIRECT
      snippet: these experiences are more strongly associated with binge-purge type disorders such as BN, BED, and AN-BP
      explanation: The rapid review identifies an association with childhood trauma and abuse across binge/purge diagnoses; it is not a necessary or sufficient cause of BN.

📚

References & Deep Research

References

DOI:10.1038/s41467-025-61496-5

Shared genetic architecture between eating disorders, mental health conditions, and cardiometabolic diseases: a comprehensive population-wide study across two countries