Definition of Anorexia nervosa:

Anorexia nervosa is an eating disorder that involves limiting the amount of food a person eats. It results in starvation and an inability to stay at the minimum body weight considered healthy for the person's age and height.

Persons with this disorder may have an intense fear of weight gain, even when they are underweight. Not eating enough food or exercising too much results in severe weight loss.

See also:

• Bulimia
• Intentional weight loss

Causes, incidence, and risk factors:

The exact causes of anorexia nervosa are unknown. Many factors probably are involved. Genetics and social attitudes toward body appearance may play a role. Some experts have suggested that conflicts within a family may contribute to this eating disorder.

Anorexia is more common in people who have relatives with the disorder.

Risk factors include:

• Accepting society's attitudes about thinness
• Being a perfectionist
• Being female
• Experiencing childhood anxiety
• Feeling increased concern or attention to weight and shape
• Having eating and gastrointestinal problems during early childhood
• Having a family history of addictions or eating disorders
• Having parents who are concerned about weight and weight loss
• Having a negative self-image

Anorexia nervosa usually occurs in adolescence or young adulthood. It is more common in females. The eating disorder is seen mainly in Caucasian women who are high academic achievers and who have a goal-oriented family or personality.