Final answer:
The most common cognitive disturbance in individuals with anorexia nervosa is a distorted body image. This perception is associated with body dysmorphic disorder and leads to severe physical and mental health issues.
Step-by-step explanation:
The most common cognitive disturbance seen in individuals with anorexia nervosa is c) Distorted body image. This is a hallmark characteristic of anorexia nervosa, where individuals consistently eat very little despite possibly being obsessed with food and maintain an unrealistic perception of their own body weight. They see themselves as overweight even when they are dangerously thin.
Individuals with anorexia nervosa may suffer from body dysmorphic disorder, a condition where a person can't stop thinking about one or more perceived defects or flaws in their appearance, which may appear minor or can't be seen by others. Moreover, anorexia nervosa is associated with various adverse health consequences such as bone loss, heart failure, kidney failure, and in extreme cases, can lead to death.