Anorexia nervosa is an eating disorder characterized by attempts to lose weight to the point of starvation. A person with anorexia nervosa may exhibit a number of signs and symptoms, the type and severity of which may vary and be

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There is evidence for biological, psychological, developmental, and sociocultural risk factors, but the exact cause of eating disorders is unknown.
Genetic
Anorexia nervosa is highly heritable. Twin studies have shown a

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Evidence from physiological, pharmacological and neuroimaging studies suggest serotonin(also called 5-HT) may play a role in

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A diagnostic assessment includes the person's current circumstances, biographical history, current symptoms, and family history. The assessment also includes a

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AN has the highest mortality rate of any psychological disorder. The mortality rate is 11 to 12 times greater than in the general population,

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Anorexia is estimated to occur in 0.9% to 4.3% of women and 0.2% to 0.3% of men in Western countries at some point in their life. About 0.4% of young females are affected in a given year and it is estimated to occur three to ten times less commonly in males. Rates in most of

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There is no conclusive evidence that any particular treatment for anorexia nervosa works better than others.
Treatment for anorexia

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