Genetics play a big role in anorexia nervosa

Reuters:

A study of twins in Sweden found that about 56 percent of the risk for developing the eating disorder is based on family history, the report from the University of North Carolina at Chapel Hill said. Other unspecified factors triggered the disorder in 44 percent of the cases, the study said.

Anorexia, an eating disorder that causes victims to have an extreme fear of obesity and an aversion to food, has one of the highest death rates of any mental disorder, the study said.

"Anorexia is a moderately heritable psychiatric disorder that may be predicted by the presence of early neuroticism" characterized by low self-esteem, emotional instability and feelings of depression, anxiety and guilt, the study said.

The finding was based on a data bank of more than 31,000 twins in Sweden born between 1935 and 1958 whose health histories have been tracked on a number of fronts. Researchers found that 1.2 percent of women in the group, and less than 1 percent of men, had the disorder.

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