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→Factors Credited As Contributory
Many factors of society are at times credited with causing the number of eating disorders to increase. For example, the [[media]] perception of larger-than-average bodies as 'too fat', or something that must be changed via dieting, can contribute to many having an unhealthy body image. Also, some have cited society's pressure on women to be thin and desirable, and on men to be large and muscular, as something that can enhance eating disorders.
Many factors of society are at times credited with causing the number of eating disorders to increase. For example, the [[media]] perception of larger-than-average bodies as 'too fat', or something that must be changed via dieting, can contribute to many having an unhealthy body image. Also, some have cited society's pressure on women to be thin and desirable, and on men to be large and muscular, as something that can enhance eating disorders.
Research has also suggested that biological factors contribute to the occurrence of anorexia. For example, eating disorders in general have a [[heritability index]] of about 0.50<ref>Klump KL, Kaye WH, & Strober M (2001). The evolving genetic foundations of eating disorders. ''Psychiatry Clinics of North America, 24'', 212-225.</ref> Anorexia appears to be linked to dysfunction in [[brain]] [[serotonin]] symptoms.<ref>Kaye WH, Frank GK, Bailer UF, Henry SE, Meltzer CC, et al. (2005). Serotonin alterations in anorexia and bulimia nervosa: New insights from imaging studies. ''Physiology & Behavior, 85'', 73-81.</ref>
==Circular reasoning==
==Circular reasoning==