Document details for 'The relationship between BMI and percent body fat, measured by bioelectrical impedance, in a large adult sample is curvilinear and influenced by age and sex'

Authors Meeuwsen, S., Horgan, G.W. and Elia, M.
Publication details Clinical Nutrition 29(5), 560-566.
Abstract We present the results of examining body composition variations in a large self-selected sample of 24,128 UK adults aged 20-70, measured by Bio-impedance equipment. The expected pattern of increasing body fat with age in both men and women is found, with a fairly steady increase across all age decades. We also show that although lean mass percentage inevitably declines as fat mass percentage increases, the pattern for absolute lean mass also shows a decrease with age, accelerating after about 45-50. Little regional variation is found, although the variations are significant in women. Examination of the association between fat percentage and body mass index shows that at a fixed BMI, body fat increases with age. This illustrates one of the weaknesses in using BMI as an indicator of body fat.
Last updated 2011-03-17

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