Definition of Bulimia:

Bulimia is an illness defined by food binges or recurrent episodes of significant overeating accompanied by a sense of loss of control. The affected person then uses various methods -- such as vomiting or laxative abuse -- to prevent weight gain.

Many, but not all, people with bulimia may also have anorexia nervosa, another eating disorder.

Causes, incidence, and risk factors:

In bulimia, eating binges may occur as often as several times daily for many months. These binges cause a sense of self-disgust, which leads to compensatory behaviors like self-induced vomiting or excessive exercise. A person with bulimia may also abuse laxatives, diuretics, or enemas in order to prevent weight gain.

Such behaviors can be quite dangerous and may lead to serious medical complications over time. For example, the stomach acid which is introduced into the esophagus (the tube from the mouth to the stomach) during frequent vomiting can permanently damage this area.

Many more women than men have bulimia, and the disorder is most common in adolescent girls. The affected person is usually aware that her eating pattern is abnormal and may experience fear or guilt associated with the binge-purge episodes. Although the behavior is usually secretive, clues to this disorder include overactivity, peculiar eating habits or rituals, and frequent weighing.

Body weight is usually normal, although the person may perceive themselves as overweight. If bulimia is accompanied by anorexia, body weight may be extremely low.

The exact cause of bulimia is unknown, but genetic, constitutional, psychological, trauma, family, society, or cultural factors may play a role. Any given case is likely due to more than one factor.