The body-mass index of twins who have been reared apart - PubMed (original) (raw)
. 1990 May 24;322(21):1483-7.
doi: 10.1056/NEJM199005243222102.
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- PMID: 2336075
- DOI: 10.1056/NEJM199005243222102
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The body-mass index of twins who have been reared apart
A J Stunkard et al. N Engl J Med. 1990.
Free article
Abstract
To assess the relative importance of genetic and environmental effects on the body-mass index (weight in kilograms divided by the square of the height in meters), we studied samples of identical and fraternal twins, reared apart or reared together. The samples consisted of 93 pairs of identical twins reared apart, 154 pairs of identical twins reared together, 218 pairs of fraternal twins reared apart, and 208 pairs of fraternal twins reared together. The intrapair correlation coefficients of the values for body-mass index of identical twins reared apart were 0.70 for men and 0.66 for women. These are the most direct estimates of the relative importance of genetic influences (heritability) on the body-mass index, and they were only slightly lower than those for twins reared together in this and earlier studies. Similar estimates were derived from maximum-likelihood model-fitting analyses--0.74 for men and 0.69 for women. Nonadditive genetic variance made a significant contribution to the estimates of heritability, particularly among men. Of the potential environmental influences, only those unique to the individual and not those shared by family members were important, contributing about 30 percent of the variance. Sharing the same childhood environment did not contribute to the similarity of the body-mass index of twins later in life. We conclude that genetic influences on body-mass index are substantial, whereas the childhood environment has little or no influence. These findings corroborate and extend the results of earlier studies of twins and adoptees.
Comment in
- Destiny rides again as twins overeat.
Sims EA. Sims EA. N Engl J Med. 1990 May 24;322(21):1522-4. doi: 10.1056/NEJM199005243222109. N Engl J Med. 1990. PMID: 2104505 No abstract available. - Heritability of weight gain and obesity.
[No authors listed] [No authors listed] N Engl J Med. 1990 Oct 11;323(15):1067-9. doi: 10.1056/NEJM199010113231512. N Engl J Med. 1990. PMID: 2215567 No abstract available. - Body-mass indexes of British separated twins.
MacDonald A, Stunkard A. MacDonald A, et al. N Engl J Med. 1990 May 24;322(21):1530. doi: 10.1056/NEJM199005243222113. N Engl J Med. 1990. PMID: 2336081 No abstract available.
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