A patient describes weekly episodes of eating large amounts of food rapidly until uncomfortably full, followed by intense shame and secrecy — but no vomiting, fasting, or excessive exercise afterward. The most appropriate diagnosis is:
ABulimia nervosa — the binge pattern alone establishes the diagnosis
BBinge Eating Disorder — recurrent binge episodes with distress but no compensatory behaviors
CPurging disorder — binge eating without purging is classified separately from BED
DOvereating disorder — BED requires purging to be clinically distinct from normal overeating
The defining distinction between BED and bulimia nervosa is the absence of compensatory behaviors — no purging, excessive exercise, or fasting to offset the binge. The patient meets the core BED criteria: recurrent discrete binge episodes (large amount in bounded time + loss of control) with marked distress and no compensation. Option A is incorrect because bulimia requires compensatory behaviors. Option D is wrong because BED is a distinct diagnosis since DSM-5 and does not require purging — in fact, the absence of purging is what defines it.
Question 2 Multiple Choice
A therapist notes that a patient with BED reports using bingeing to cope with anxiety and loneliness, then feeling profound shame after each episode — which itself triggers further anxiety. Which mechanism does this illustrate?
APositive reinforcement: bingeing produces pleasure that reinforces the behavior
BClassical conditioning: anxiety becomes a conditioned stimulus for food intake
CNegative reinforcement: bingeing reduces immediate negative affect, increasing future bingeing as an emotion-regulation strategy, while the shame produced becomes a new trigger
DCognitive dissonance: the patient eats to resolve conflicting beliefs about food and self-worth
The maintenance cycle of BED is driven by negative reinforcement, not positive reinforcement. Bingeing temporarily relieves negative emotional states (anxiety, loneliness, distress) — that relief reinforces bingeing as an emotion-regulation strategy. But the episode then generates shame and distress, which become new emotional triggers that increase vulnerability to future binge episodes. This is the core self-perpetuating cycle: bingeing → temporary relief → shame → emotional dysregulation → bingeing again. Understanding this cycle is essential for CBT targeting BED, which specifically addresses the emotional avoidance and distorted cognitions that maintain it.
Question 3 True / False
Binge Eating Disorder is the most common eating disorder in the general population.
TTrue
FFalse
Answer: True
BED is more prevalent than anorexia nervosa and bulimia nervosa combined. It has a lifetime prevalence of approximately 2-3% in adults, compared to ~1% for bulimia and less than 1% for anorexia. Despite being more common, BED received formal DSM recognition only in DSM-5 (2013), having previously appeared only as a research category. Its higher prevalence partly reflects that it occurs across a wide range of body weights and ages and is not limited to demographic groups stereotypically associated with eating disorders.
Question 4 True / False
Binge Eating Disorder is defined by obesity — individuals who binge eat but are not obese do not meet the diagnostic criteria.
TTrue
FFalse
Answer: False
BED is not defined by body weight and does not require obesity for diagnosis. The diagnostic criteria focus entirely on behavioral and psychological features: recurrent binge episodes (eating a large amount in a discrete time period with loss of control), marked distress about binge eating, and occurring at least once a week for three months — with no compensatory behaviors. BED occurs across a full range of body weights. While BED has high comorbidity with obesity, many individuals with obesity do not have BED, and many individuals with BED are not obese. Conflating BED with obesity is both clinically inaccurate and contributes to stigma.
Question 5 Short Answer
Why is lisdexamfetamine (an ADHD medication) an FDA-approved treatment for BED, and what does this tell us about the underlying nature of the disorder?
Think about your answer, then reveal below.
Model answer: Lisdexamfetamine works via dopaminergic and noradrenergic mechanisms that improve inhibitory control — the same mechanisms that reduce impulsivity in ADHD. Its effectiveness in BED reflects that impulsivity and difficulty inhibiting prepotent responses (like eating in response to food cues) are central features of BED, not incidental to it. This shared pharmacology supports a model of BED as a disorder of reward circuitry and inhibitory control, similar to other behavioral addictions, rather than a problem of willpower, motivation, or simply poor eating habits.
The pharmacological evidence is a window into the neurobiology: BED involves dysregulation in dopaminergic reward and inhibitory control pathways. If BED were primarily about emotional eating or food preferences, a stimulant that improves impulse control would not be the effective treatment. The ADHD connection also suggests that impulsive responding to food cues — difficulty overriding a prepotent eating response despite wanting to — is mechanistically central. This reframing has clinical implications: treating BED requires addressing the impulsivity and reward circuitry dysregulation, not just the beliefs or behaviors around food.