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Journal Article
Research Support, Non-U.S. Gov't
Genetic influences on eating attitudes in a normal female twin population.
Psychological Medicine 1993 May
The Eating Attitudes Test (EAT) and the Eating Disorder Inventory (EDI) were administered to a female volunteer twin population aged 18 to 45 years. Both members of 147 monozygotic (MZ) and 99 dizygotic (DZ) twin pairs completed the questionnaires. Thirty-five subjects scored over the cut-off point of the EAT-26. Interviews of these high-scoring twins and their co-twins identified three subjects with a past history of anorexia nervosa, and three others with a history of a partial syndrome. A heritability value of 41% was obtained for the overall EAT scores, while factor analysis produced a 'dieting' factor with a heritability of 42%. The 'body dissatisfaction' and 'drive for thinness' subscales of the EDI had heritability values of 52 and 44% respectively. The genetic contribution to the variance in body mass index in the twin sample was estimated at 64%. For all the above phenotypes, an environmental model of transmission with heritability constrained to be zero, could be rejected. Conversely, we were unable to reject a purely additive genetic model with shared environmental variance constrained at zero, suggesting that family environment has little or no effect on the transmission of many of these traits.
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