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Relation of BMI to fat and fat-free mass among children and adolescents

Freedman, D S, Wang, J, Maynard, L M, Thornton, J C, Mei, Z, Pierson, R N, Dietz, W H, Horlick, M·2005·International Journal of Obesity
DOI 10.1038/sj.ijo.0802735
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Abstract

Objective Although the body mass index (BMI, kg/m2) is widely used as a surrogate measure of adiposity, it is a measure of excess weight, rather than excess body fat, relative to height. We examined the relation of BMI to levels of fat mass and fat-free mass among healthy 5- to 18-y-olds. Methods and procedures Dual-energy X-ray absorptiometry was used to measure fat and fat-free mass among 1196 subjects. These measures were standardized for height by calculating the fat mass index (FMI, fat mass/ht2) and the fat-free mass index (FFMI, fat-free mass/ht2). Results The variability in FFMI was about 50% of that in FMI, and the accuracy of BMI as a measure of adiposity varied greatly according to the degree of fatness. Among children with a BMI-for-age > or =85th P, BMI levels were strongly associated with FMI (r=0.85-0.96 across sex-age categories). In contrast, among children with a BMI-for-age or =85th P. Discussion BMI levels among children should be interpreted with caution. Although a high BMI-for-age is a good indicator of excess fat mass, BMI differences among thinner children can be largely due to fat-free mass.

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Crossref · 10.1038/sj.ijo.0802735

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  • BMI is generally used as an accurate tool for estimating body fat mass in obese adolescents, but differences in this index between thinner children can be largely attributable to fat-free mass, as BMI does not distinguish between body fat and muscle mass.

    “Although BMI is generally used as an accurate tool for estimating body fat mass in obese adolescents, differences in this index between thinner children can be largely attributable to fat-free mass [65], as BMI does not distinguish between body fat and muscle mass, which weighs more than fat.”

    From Simulation of facial growth based on longitudinal data: Age progression and age regression between 7 and 17 years of age using 3D surface data (2019) · cites this paper as [65]

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Metadata

Authors
Freedman, D. S., Wang, J., Maynard, L. M., Thornton, J. C., Mei, Z., Pierson, R. N., Dietz, W. H., & Horlick, M.
Venue
International Journal of Obesity
Publisher
Springer Science and Business Media LLC
Published
2004-07-27
Volume
29
Issue
1
Pages
1-8
ISSN
  • 0307-0565
  • 1476-5497
DOI
10.1038/sj.ijo.0802735
Cited by
352
References
2
Language
en
Licence
www.springer.com/tdm (tdm)

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