Protein intake and lean body mass preservation during energy intake restriction in overweight older adults

Background: Dietary-induced weight loss is generally accompanied by a decline in skeletal muscle mass. The loss of muscle mass leads to a decline in muscle strength and impairs physical performance. A high dietary protein intake has been suggested to allow muscle mass preservation during energy inta...

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Published inInternational Journal of Obesity Vol. 40; no. 2; pp. 299 - 304
Main Authors Backx, E M P, Tieland, M, Borgonjen-van den Berg, K J, Claessen, P R, van Loon, L J C, de Groot, L C P G M
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 01.02.2016
Nature Publishing Group
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Summary:Background: Dietary-induced weight loss is generally accompanied by a decline in skeletal muscle mass. The loss of muscle mass leads to a decline in muscle strength and impairs physical performance. A high dietary protein intake has been suggested to allow muscle mass preservation during energy intake restriction. Objective: To investigate the impact of increasing dietary protein intake on lean body mass, strength and physical performance during 12 weeks of energy intake restriction in overweight older adults. Design: Sixty-one overweight and obese men and women (63±5 years) were randomly assigned to either a high protein diet (HP; 1.7 g kg −1 per day; n= 31) or normal protein diet (NP; 0.9 g kg −1 per day; n= 30) during a 12-week 25% energy intake restriction. During this controlled dietary intervention, 90% of the diet was provided by the university. At baseline and after the intervention, body weight, lean body mass (dual-energy X-ray absorptiometry), leg strength (1-repetition maximum), physical performance (Short Physical Performance Battery, 400 m) and habitual physical activity (actigraph) were assessed. Results: Body weight declined in both groups with no differences between the HP and NP groups (−8.9±2.9 versus −9.1±3.4 kg, respectively; P =0.584). Lean body mass declined by 1.8±2.2 and 2.1±1.4 kg, respectively, with no significant differences between groups ( P =0.213). Leg strength had decreased during the intervention by 8.8±14.0 and 8.9±12.8 kg, with no differences between groups ( P =0.689). Physical performance as measured by 400 m walking speed improved in both groups, with no differences between groups ( P =0.219). Conclusions: Increasing protein intake above habitual intake levels (0.9 g kg −1 per day) does not preserve lean body mass, strength or physical performance during prolonged energy intake restriction in overweight older adults.
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ISSN:0307-0565
1476-5497
DOI:10.1038/ijo.2015.182