Pers Individ Dif. 2011 Sep;51(4):402-405.

The 2 to 4 digit ratio (2D:4D) and eating disorder diagnosis in women.

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School of Psychology, Charles Stuart University, Bathurst, NSW 2795, Australia, .

Abstract

Eating disorders are more common in females than in males and are believed to be caused, in part, by biological and hormonal factors. Digit ratio or 2D:4D (the ratio of the 2(nd) to the 4(th) digit) is considered to be a proxy for prenatal testosterone (PT) and prenatal oestrogen (PE) exposure. However, how 2D:4D may be related to type of eating pathology is unknown. The relationship between 2D:4D and eating disorder diagnosis was investigated in recovered and currently eating disordered (n=31) and control (n=99) women. Mean 2D:4D ratio was significantly lower (indicating higher levels of PT and lower levels of PE) in anorexic (AN) compared to bulimic (BN) women, with controls intermediary. In eating disordered women, 2D:4D was positively and significantly related to current weight, lowest weight and current BMI, with strongest associations for right 2D:4D. Among women, low 2D:4D is related to AN and high 2D:4D to BN, suggesting a differential causal influence of prenatal sex hormones on later eating pathology.

PMID:: 21765573; [PubMed]
PMCID:: PMC3134962; [Available on 2012/9/1]

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F31 MH083382-01A2/NIMH NIH HHS/United States

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The 2 to 4 digit ratio (2D:4D) and eating disorder diagnosis in women.
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The 2 to 4 digit ratio (2D:4D) and eating disorder diagnosis in women.

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