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Line 13: − − ==Circular reasoning== − − Many sources speak of the condition as if it caused itself. Anorexia is a syndrome in which a person chooses to starve themselves, out of an exaggerated fear of gaining weight. The National Women's Health Information Center, a federally sponsored program, claims that anorexia ''causes this fear''.<ref>[http://www.4women.gov/faq/easyread/anorexia-etr.htm Womanshealth.gov]</ref>
the source doesn't say that at all, which means that the "circle" is broken
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>
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>
==Variations==
==Variations==