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No one can state with certainty what causes eating disorders. As with other behavioral disorders, anorexia, bulimia, and other eating disorders most likely result from a complex interaction of biological, psychological, family, genetic, environmental and social factors. Possible causes of eating disorders include: Genetics and biology.
Eating disorders may also have physical causes. Changes in hormones that control how the body and mind maintain mood, appetite, thinking, and memory can foster eating disorders. The fact that anorexia nervosa tends to run in families also suggests that a susceptibility to the disorder may be hereditary.