## Core Concept
Anorexia nervosa is a psychological eating disorder characterized by an intense fear of gaining weight and a distorted body image, leading to restricted food intake and excessive weight loss. The condition is often associated with amenorrhea, osteoporosis, and other metabolic complications. It primarily affects young females but can also occur in males.

## Why the Correct Answer is Right
The correct answer, although not directly provided, would relate to a statement that does not accurately describe a characteristic or consequence of anorexia nervosa. Typically, characteristics of anorexia nervosa include a distorted body image, fear of gaining weight, restricted eating patterns, and significant weight loss. Complications can involve hormonal imbalances, such as amenorrhea (loss of menstrual cycle), due to the body's stress response and decreased body fat.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on option A, we can infer that if it describes a common feature or complication of anorexia nervosa (like amenorrhea, osteoporosis, or a psychological aspect), it would be a correct statement about the disorder.
- **Option B:** Similarly, if option B aligns with known characteristics or effects of anorexia nervosa, it would not be the correct answer to the question asking for an "all except" scenario.
- **Option C:** This option would also be incorrect if it accurately represents a trait or consequence associated with anorexia nervosa.
- **Option D:** The statement in option D is identified as not true about anorexia nervosa, making it the correct answer to the question. Without the specific content of D, we acknowledge it's chosen as the exception.

## Clinical Pearl / High-Yield Fact
A key point to remember is that anorexia nervosa has one of the highest mortality rates among psychiatric disorders, primarily due to starvation, suicide, and cardiac complications. Early recognition and intervention are critical. A useful clinical clue is the presence of amenorrhea in females, which can be an indicator of the severity of the disorder and its impact on hormonal balance.

## Correct Answer: D.