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As shown in pairings involving 2,845 biological children and 147 adopted children, fatness of the children increases in stepwise fashion according to parental fatness combinations (Lean X Lean through Obese X Obese) for both biological and for social (i.e., adopted) children as well, thus indicating that fatness (while strongly familial) is not necessarily genetic.
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Garn et al. (1977) studied this question.
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