The diagnosis of anorexia nervosa requires a weight loss of what percentage or more of body weight?

The correct answer is a weight loss of 15% or more of body weight, which aligns with the clinical criteria for diagnosing anorexia nervosa. This significant percentage reflects the severity of the disorder, as individuals with anorexia often have an intense fear of gaining weight and a distorted body image. A weight loss of 15% can indicate a significant impairment in physical health and nutritional status, which are crucial considerations in the diagnosis.

The significance of the 15% threshold lies in its recognition that this level of weight loss often leads to serious health complications, including hormonal imbalances, cardiovascular issues, and metabolic disturbances. This percentage establishes a clear guideline for healthcare professionals to identify individuals at high risk and in need of intervention.