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Effect of dietary protein on bone loss in elderly men and women

varrinique

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Few studies have evaluated protein intake and bone loss in elders. Excess protein may be associated with negative calcium balance, whereas low protein intake has been associated with fracture. We examined the relation between baseline dietary protein and subsequent 4-year change in bone mineral density (BMD) for 391 women and 224 men from the population-based Framingham Osteoporosis Study. BMD (g/cm[2]) was assessed in 1988-1989 and in 1992-1993 at the femur, spine, and radius. Usual dietary protein intake was determined using a semiquantitative food frequency questionnaire (FFQ) and expressed as percent of energy from protein intake. BMD loss over 4 years was regressed on percent protein intake, simultaneously adjusting for other baseline factors: age, weight, height, weight change, total energy intake, smoking, alcohol intake, caffeine, physical activity, calcium intake, and, for women, current estrogen use. Effects of animal protein on bone loss also were examined. Mean age at baseline (±SD) of 615 participants was 75 years (±4.4; range, 68-91 years). Mean protein intake was 68 g/day (±24.0; range, 14-175 g/day), and mean percent of energy from protein was 16% (±3.4; range, 7-30%). Proportional protein intakes were similar for men and women. Lower protein intake was significantly related to bone loss at femoral and spine sites (p ≤ 0.04) with effects similar to 10 lb of weight. Persons in the lowest quartile of protein intake showed the greatest bone loss. Similar to the overall protein effect, lower percent animal protein also was significantly related to bone loss at femoral and spine BMD sites (all p < 0.01) but not the radial shaft (p = 0.23). Even after controlling for known confounders including weight loss, women and men with relatively lower protein intake had increased bone loss, suggesting that protein intake is important in maintaining bone or minimizing bone loss in elderly persons.

Revue / Journal Title
Journal of bone and mineral research (J. bone miner. res.) ISSN 0884-0431 CODEN JBMREJ

Editeur / Publisher
American Society for Bone and Mineral Research, Duham, NC, ETATS-UNIS (1986) (Revue)

Reference:
http://cat.inist.fr/?aModele=afficheN&cpsidt=825631
 
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