Anorexia nervosa, which literally means nervosa loss of appetite, has been defined as a refusal to maintain a weight that is at least 85% of the expected weight for one’s height and age.
Anorexic individual are also characterized by a strong fear of becoming overweight; a distorted body image (a tendency to view themselves as fat even when they are emaciated); and, if they are females, and absence of regular menstrual cycles. Up to one 1% of adolescent girls suffer from this condition, and 95 out of 100 of its victims are females.

Bulimia nervosa, the so-called binge/purge syndrome, is also rooted in a strong “fear of fat”; it’s victim believe they are far fatter than they are and want to be far thinner. Bulimia is more prevalent than anorexia, affecting up to about 5% of high school and college male.
Eating Disorders