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Eating Disorders
Eating disorders involve serious disturbances in eating behavior, such as extreme and
unhealthy reduction of food intake or severe overeating, as well as feelings of distress
or extreme concern about body shape or weight. Researchers are investigating how and
why initially voluntary behaviors, such as eating smaller or larger amounts of food than
usual, at some point move beyond control in some people and develop into an eating
disorder.
Eating disorders are not due to a failure of will or behavior; rather, they are real,
treatable medical illnesses in which certain maladaptive patterns of eating take on a life
of their own. The main types of eating disorders are anorexia nervosa and bulimia
nervosa. A third type, binge-eating disorder, has been suggested but has not yet been
approved as a formal psychiatric diagnosis. Eating disorders frequently develop during
adolescence or early adulthood, but some reports indicate their onset can occur during
childhood or later in adulthood.
--National Institute of Mental Health