Eating Disorders are characterized by a disturbance in eating behavior. There are two main types of eating disorders,
Anorexia Nervosa and Bulimia Nervosa.
Anorexia Nervosa is characterized by a refusal eat that leads to a below normal body weight.
Bulimia Nervosa is characterized by repeated binge eating followed by self-inducing vomiting, misusing laxatives, fasting, or excessive exercise.
Other definition:
Severe disturbances in eating behavior characterized by preoccupation with weight and unhealthy efforts to control weight.