American Journal of Clinical Nutrition, Vol 47, 629-635, Copyright © 1988 by The American Society for Clinical Nutrition, Inc

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Familial resemblance in energy intake: contribution of genetic and environmental factors

L Perusse, A Tremblay, C Leblanc, CR Cloninger, T Reich, J Rice and C Bouchard
Physical Activity Sciences Laboratory, Laval University, Ste-Foy, Quebec, Canada.

Total energy intake and intakes of carbohydrate, fat, and protein as well as the percentage of energy derived from these nutrients were calculated from a 3-d dietary record in 1597 subjects living in 375 families of French descent. Familial correlations were computed in pairs of biological relatives and relatives by adoption and used in the path-analysis BETA model to determine the contribution of genetic and nongenetic factors in the familial resemblance observed in energy intake. No significant genetic effect was found for intake of any nutrient tested (h2 less than or equal to 11%) and cultural inheritance was found to be more important than genetic inheritance. Nontransmitted environmental factors, including home environmental effects, were found to account for more than 50% of the variation observed in the energy- intake components. These results suggest that the average genetic influence on nutrient intake is negligible and that nongenetic effects associated mainly with home environmental effects are the major affecters of energy intake.

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