No one knows for sure what causes binge eating disorder. As a number of as half of all people with binge eating disorder are depressed or have been depressed in the past. Whether depression causes binge eating disorder or whether binge eating disorder causes depression is not known.

It is also unclear if dieting and binge eating are related. Some people binge eat after dieting. Dieting here means skipping meals, not eating enough food each day, or avoiding certain kinds of food. These are unhealthy ways to try to change your body shape and weight.

Studies suggest that people with binge eating may have trouble handling some of their emotions. A number of people who are binge eaters say that being angry, sad, bored, worried, or stressed can cause them to binge eat.

Certain behaviors and emotional problems are more common in people with binge eating disorder. These include abusing alcohol, acting quickly without thinking (impulsive behavior), not feeling in charge of themselves, not feeling a part of their communities, and not noticing and talking about their feelings.

Scientists are looking into how brain chemicals and metabolism (the way the body uses calories) affect binge eating disorder. Other research suggests that genes may be involved in binge eating, since the disorder often occurs in several members of the same family. This research is still in the early stages.

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