psychiatric disorders
Anorexia Nervosa
Etiology of Anorexia Nervosa
The etiology of anorexia nervosa is unknown. Other than being female, few risk factors have been identified. In some cultures, obesity is considered unattractive and unhealthy, and the desire to be thin is pervasive, even among children. More than 50% of prepubertal girls in the US diet or take other measures to control their weight. Excessive concern about weight or a history of dieting appears to indicate increased risk, and there is a genetic predisposition, and genome-wide studies have begun to identify specific loci that are associated with increased risk. Family and social factors probably play a role. Many patients belong to middle or upper socioeconomic classes, are meticulous and compulsive, have average intelligence, and have very high standards for achievement and success. 