<human>:  How many people are affected by the mental disorder, Anorexia Nervosa?
<bot>: Anorexia Nervosa affects about 1% of the population. It is a psychiatric disorder that involves an intense fear of gaining weight and of becoming fat. The disease is characterized by self-starvation and an intense fear of gaining weight. People with anorexia nervosa may experience intense anxiety and depression, and they may be at risk for suicide.