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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.

Metabolism: Clinical and Experimental

|November 1, 1995

Summary

Lean body mass (LBM) shows significant genetic influence, with heritability higher than body fat. Environmental factors also impact LBM, particularly in thinner individuals.

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Area of Science:

Human genetics
Body composition analysis
Twin studies

Background:

Understanding the heritability of body composition is crucial for metabolic and nutritional research.
Twin studies provide a powerful model for dissecting genetic and environmental contributions to complex traits.

Purpose of the Study:

To investigate the genetic and environmental influences on lean body mass (LBM).
To compare the heritability of LBM with that of body fat.
To examine the relationship between weight variation and LBM variation.

Main Methods:

Utilized potassium-40 counting to determine lean body mass.
Compared intrapair variances in lean body mass and body fat between monozygous (MZ) and dizygous (DZ) twins.
Analyzed correlations between intrapair differences in LBM and weight.

Main Results:

Lean body mass (LBM) demonstrated a significant genetic influence, with higher heritability compared to body fat.
Intrapair variances for LBM were considerably smaller than those for body fat.
A correlation was observed between intrapair LBM and weight differences, indicating environmental impact.
Weight variation influenced LBM variation more in leaner individuals.

Conclusions:

Lean body mass (LBM) is substantially influenced by genetic factors.
Environmental factors play a significant role in modulating LBM, especially in relation to weight changes.
The interplay between genetics and environment shapes overall body composition.

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