The sexual competition hypothesis for eating disorders.

A hypothesis is presented for eating disorders, based on Darwinian theory, that contends that these syndromes together with the phenomenon of the pursuit of thinness are manifestations of female intra-sexual competition. It is suggested that eating disorders originate in the human female's psychological adaptation of concern about physical attractiveness which is an important component of female 'mate attraction' and 'mate retention' strategies. It is argued that present-day environment of Western countries presents a range of conditions which have led to the overactivation or the disruption of the archaic female sexual strategy of maximizing 'mate value'. The present hypothesis deals with the ultimate level of causation and is therefore compatible with a range of theories of proximate causation. Although the present hypothesis is not directly testable, it makes predictions that are testable and refutable. Finally it is suggested that the sexual competition hypothesis has more explanatory power than existing evolutionary theories of eating disorders.