What distinguishes bulimia nervosa and binge-eating disorder

Question

BlackTom AI · Accepted Answer

Engagement in compensatory behaviours (e.g., self‑induced vomiting, misuse of laxatives/diuretics, fasting, or excessive exercise) distinguishes bulimia nervosa from binge‑eating disorder.

Relevant knowledge points:
- Both bulimia nervosa (BN) and binge‑eating disorder (BED) require recurrent binge‑eating episodes: eating an objectively large amount of food with a sense of loss of control.
- DSM‑5 frequency/duration criteria for both BN and BED are the same: episodes occur on average at least once per week for three months.
- The defining feature that separates BN from BED is the presence of inappropriate compensatory behaviours in BN; BED explicitly lacks these compensatory behaviours.
- Body weight is not a diagnostic separator: individuals with BN are often normal weight or overweight (unlike anorexia nervosa), and many with BED are overweight or obese, but there is overlap.

Step‑by‑step reasoning:
1. Identify commonalities: both disorders include binge episodes (large intake + loss of control).
2. Compare duration criteria: BN and BED both require bingeing at least once weekly for 3 months — so duration does not distinguish them.
3. Compare body weight: although BED is commonly associated with overweight/obesity and BN can occur at normal weight, weight alone is neither required nor sufficient to differentiate diagnostically because of substantial overlap.
4. Examine compensatory behaviours: BN includes recurrent inappropriate compensatory behaviours intended to prevent weight gain; BED explicitly lacks such behaviours. This behavioural difference is the formal diagnostic distinction.

Why the correct answer is correct:
- The presence versus absence of compensatory behaviours is the core diagnostic criterion that differentiates BN from BED in DSM‑5.

Why other options are incorrect:
- a. Body weight: not a defining diagnostic criterion and shows overlap between disorders.
- b. Duration of disorder: both disorders share the same minimum frequency/duration criteria.

Conclusion: The distinguishing feature is engagement in compensatory behaviours (option c), which matches the provided correct answer.

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