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Binge eating disorder matters because it is now recognised as a distinct diagnosis, not just an incomplete form of bulimia nervosa, and it is strongly linked to obesity. It is diagnosed as recurrent episodes of eating an unusually large amount of food with a sense of loss of control, without any regular compensatory behaviour afterwards. For example, imagine a man who eats an entire large pizza alone in under an hour, feeling unable to stop, then simply feels ashamed rather than vomiting or fasting. In practice, the absence of any compensatory act afterwards is what separates this from bulimia nervosa.

Binges are typically eaten rapidly, until uncomfortably full, alone due to embarrassment, and are followed by disgust, guilt, or depression rather than any purging behaviour. Because there is no compensation, weight steadily rises over time, and binge eating disorder is strongly associated with obesity and type 2 diabetes mellitus. Take a patient whose weight is tracked over several years of untreated binge eating disorder: it climbs steadily, unlike the relatively stable weight seen in bulimia nervosa. In practice, this weight trajectory, together with the absence of purging, points clinicians toward binge eating disorder rather than bulimia nervosa.

• What does NICE recommend as the first treatment for an adult with binge eating disorder?
• What defines a binge episode, rather than simply a large meal?
• A man has binge eating disorder alongside moderate depression. How should treatment be sequenced?

• Bulimia nervosa, adds compensatory behaviour after bingeing, unlike binge eating disorder, where no purging or fasting follows.
• Obesity from binge eating disorder, driven by recurrent loss-of-control binges, rather than the steady overeating without discrete binge episodes seen in simple overweight.
• Anorexia nervosa, centres on restriction and fear of weight gain, whereas binge eating disorder centres on bingeing without any restriction goal.
• Binge eating disorder, causes weight gain over time, unlike bulimia nervosa's typically stable, normal-range weight.

• Surgery does not treat the binge eating itself and is not a first-line psychiatric intervention.
• Admission is not required for uncomplicated binge eating disorder.
• Severe dietary restriction tends to provoke further binge eating.
• No appetite suppressant is a recommended first-line treatment.
• No calorie cut-off defines a binge in either classification system.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.