The key factor differentiating Anorexia Nervosa from Atypical Anorexia Nervosa is:

Question

BlackTom AI · Accepted Answer

Atypical Anorexia Nervosa meets the full symptomatic profile of anorexia nervosa except for the requirement of a current low body weight—specifically, despite marked weight loss and intense weight/shape concerns, the individual’s weight remains within or above the “normal” range.

1. Relevant knowledge points and concepts
- DSM-5 criteria for Anorexia Nervosa (AN) include: (a) restriction of energy intake leading to significantly low body weight, (b) intense fear of gaining weight or persistent behavior that interferes with weight gain, and (c) disturbance in the way one’s body weight/shape is experienced.  
- Atypical Anorexia Nervosa is classified under Other Specified Feeding or Eating Disorders (OSFED) and requires meeting the symptomatic criteria of AN except for the low-weight criterion.

2. Step-by-step reasoning
- Step 1: Identify core AN symptoms: restriction, fear of weight gain, body image disturbance.  
- Step 2: Check weight status: For AN, weight must be significantly below expected/normal for age/sex/development.  
- Step 3: For atypical AN, the person displays the same restrictive behaviors and cognitions but does not meet the low-weight threshold—despite substantial weight loss, current weight falls within or above normal ranges.  
- Step 4: Therefore the distinguishing factor is the presence versus absence of low body weight.

3. Intermediate steps shown
- Compare criteria: AN = symptoms + low weight; Atypical AN = symptoms without low weight. No numerical calculation is required, but the logical comparison is explicit.

4. Why the correct answer is correct
- The defining DSM-5 distinction is weight status: atypical presentations retain full psychopathology of AN yet do not meet the “significantly low weight” criterion, which is exactly the statement in the correct option.

5. Why other options are incorrect
- Option A: Incorrect—body image disturbance is usually present in atypical AN.  
- Option B: Incorrect—purging/compensatory behaviors can occur in atypical AN; absence of purging is not the defining feature.  
- Option C: Incorrect—atypical AN can still cause serious medical and functional impairment despite “normal” weight.

6. Conclusion
This reasoning confirms the provided correct answer: In Atypical Anorexia Nervosa, despite significant weight loss, the individual’s weight is still within or above the ‘normal’ weight range.

The key factor differentiating Anorexia Nervosa from Atypical Anorexia Nervosa is:单项选择题

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