Which is the most common ED?

Question

BlackTom AI · Accepted Answer

Eating Disorder Not Otherwise Specified (EDNOS) was the most commonly diagnosed eating disorder in clinical practice under DSM‑IV because many patients present with clinically significant disordered eating that does not meet the strict criteria for anorexia nervosa or bulimia nervosa.

1) Relevant knowledge points and concepts
- Diagnostic categories (DSM‑IV): anorexia nervosa, bulimia nervosa, and EDNOS (used when symptoms cause distress/impairment but do not meet full criteria for the first two).
- EDNOS encompassed a wide range of subthreshold and atypical presentations (e.g., binge‑eating episodes that did not meet frequency/duration cutoffs, atypical anorexia where weight is not below expected, purging without bingeing).
- In DSM‑5 many EDNOS cases were redistributed (EDNOS → OSFED and binge eating disorder recognized separately), but historically EDNOS was the single largest category in clinical samples.

2) Step‑by‑step reasoning
- Anorexia nervosa has relatively specific criteria (significantly low weight, intense fear of weight gain, disturbance in body image), so fewer cases meet the full syndrome.
- Bulimia nervosa requires recurrent binge eating with compensatory behaviors at a specified frequency/duration; many patients have bingeing or compensatory behavior patterns that are less frequent or atypical.
- Because EDNOS captured all the presentations that were clinically important but “subthreshold” or atypical for the two primary disorders, it accumulated the largest share of diagnoses in outpatient and inpatient settings.

3) Data context (approximate, clinical observation)
- Multiple clinical studies and epidemiologic surveys under DSM‑IV found that roughly half or more of eating‑disorder referrals were categorized as EDNOS, making it the most common single diagnosis in many settings.

4) Why the correct answer is correct
- The category EDNOS intentionally covered the broad, common set of atypical or subthreshold eating disorders, so it logically and empirically became the most frequent diagnosis.

5) Why the other options are incorrect
- Anorexia nervosa (a) is serious but less common because of its stricter weight and psychological criteria.
- Bulimia nervosa (b) is more common than anorexia in some samples but still does not exceed the aggregate of atypical/subthreshold cases grouped as EDNOS.

Conclusion: EDNOS (option c) is the correct answer and matches the provided answer.

Which is the most common ED?单项选择题

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