Dietary protein intake is associated with lean body mass in community-dwelling older adults |
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Authors: | Olof G. Geirsdottir Atli Arnarson Alfons Ramel Palmi V. Jonsson Inga Thorsdottir |
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Affiliation: | 1. Unit for Nutrition Research, National University Hospital, Faculty of Food Science and Nutrition, University of Iceland, Reykjavik, Iceland;2. The Icelandic Gerontological Research Center, University Hospital, Faculty of Medicine, University of Iceland, Reykjavik, Iceland;3. Department of Geriatrics, National University Hospital, Faculty of Medicine, University of Iceland, Reykjavik, Iceland |
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Abstract: | Lean body mass (LBM) is important to maintain physical function during aging. We hypothesized that dietary protein intake and leisure-time physical activity are associated with LBM in community-dwelling older adults. To test the hypothesis, participants (n = 237; age, 65-92 years) did 3-day weighed food records and reported physical activity. Body composition was assessed using dual-energy x-ray absorptiometry. Protein intake was 0.98 ± 0.28 and 0.95 ± 0.29 g/kg body weight in male and female participants, respectively. Protein intake (in grams per kilogram of body weight) was associated with LBM (in kilograms); that is, the differences in LBM were 2.3 kg (P < .05) and 2.0 kg (P = .054) between the fourth vs the first and the fourth vs the second quartiles of protein intake, respectively. Only a minor part of this association was explained by increased energy intake, which follows an increased protein intake. Our study shows that dietary protein intake was positively associated with LBM in older adults with a mean protein intake higher than the current recommended daily allowance of 0.8 g/kg per day. Leisure-time physical activity, predominantly consisting of endurance type exercises, was not related to LBM in this group. |
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Keywords: | Cross-sectional study Dietary proteins Physical activity Body composition Aging |
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