Human brain mass: similar body composition associations as observed across mammals

American Journal of Human Biology : the Official Journal of the Human Biology Council
Steven B HeymsfieldWei Shen

Abstract

A classic association is the link between brain mass and body mass across mammals that has now been shown to derive from fat-free mass (FFM) and not fat mass (FM). This study aimed to establish for the first time the associations between human brain mass and body composition and to compare these relations with those established for liver as a reference organ. Subjects were 112 men and 148 women who had brain and liver mass measured by magnetic resonance imaging with FM and FFM measured by dual-energy X-ray absorptiometry. Brain mass scaled to height (H) with powers of ≤0.6 in men and women; liver mass and FFM both scaled similarly as H(~2) . The fraction of FFM as brain thus scaled inversely to height (P < 0.001) while liver mass/FFM was independent of height. After controlling for age, brain, and liver mass were associated with FFM while liver was additionally associated with FM (all models P ≤ 0.01). After controlling for age and sex, FFM accounted for ~5% of the variance in brain mass while levels were substantially higher for liver mass (~60%). Brain mass was significantly larger (P < 0.001) in men than in women, even after controlling for age and FFM. As across mammals, human brain mass associates significantly, although w...Continue Reading

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Citations

Jul 26, 2013·Journal of Nutritional Science and Vitaminology·Satomi OshimaMitsuru Higuchi
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Oct 13, 2020·Clinical Nutrition : Official Journal of the European Society of Parenteral and Enteral Nutrition·Martijn van BeersAnnemie M W J Schols

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