Which set of behaviors and signs should raise concern for a possible eating disorder and prompt a referral for help?

• A. Complete lack of any dietary interest combined with increased appetite and steady weight gain over a long period, exclusively in the absence of psychological or social changes.
• B. Only minor variations in meal timing that last a few days, occasional skipping of dessert at social events without any psychological distress or caloric restriction, and stable body weight without functional impairment.
• C. Marked weight change, preoccupation with food or calories, repeated bingeing or purging episodes, amenorrhea in females, excessive exercise, frequent sore throats or dental erosion, and social withdrawal.
• D. Any isolated instance of overeating at a party or holiday meal, which always meets the threshold for an eating disorder and requires immediate admission to an inpatient psychiatric unit.

Answer: (C)