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Updated: Aug 10, 2026

Assessment of Child Anthropometry in a Large Epidemiologic Study
Published on: February 2, 2017
Lean body mass in twins
G B Forbes1, E P Sauer, L R Weitkamp
1Department of Pediatrics, University of Rochester School of Medicine and Dentistry, NY 14642, USA.
Abstract:
A study of 49 pairs of monozygous (MZ) twins and 38 pairs of same-sexed dizygous (DZ) twins showed that lean body mass (LBM), as determined by potassium 40 counting, is under genetic influence. Intrapair variances for LBM are much smaller than those for body fat, which suggests that LBM has a higher degree of heritability. There is a correlation between the magnitude of intrapair LBM differences and intrapair weight differences for both sets of twins, showing that environment is also an important influence. The effect of weight variation on LBM variation is greater for thin people than for those with appreciable burdens of body fat, an observation previously made on individuals who undergo a nutrition-induced weight change.
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