In cases of anorexia nervosa, what is a common physical symptom caused by malnutrition?

In cases of anorexia nervosa, a common physical symptom caused by malnutrition is fine, downy hair growth, known as lanugo. This occurs as the body attempts to maintain warmth in response to significant weight loss and the resulting drop in body fat. In an effort to conserve heat, the body may develop this fine layer of hair, which can be especially prominent in individuals who have lost a considerable amount of weight.

The presence of lanugo is a sign of the body's attempt to adapt to extreme conditions by modifying its physiological responses. Unlike the other options, which may not typically be associated with malnutrition in anorexia, lanugo specifically indicates the severity of malnutrition and the body's distress signals in the face of insufficient body fat and caloric intake.

Understanding this symptom is crucial, as it not only signifies the physical impact of the disorder but also serves as a reminder of the need for appropriate treatment and intervention. Recognizing lanugo can help healthcare providers assess the severity of anorexia nervosa and tailor their approaches to restoring the individual's health.