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Effect of dietary protein on bone status in US Adults aged 50 years and older; NHANES 1999–2004
Author(s) -
Kim Jung Eun,
Zanovec Michael,
Fulgoni Victor L,
Campbell Wayne W
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.249.3
Subject(s) - medicine , bone mineral , endocrinology , body mass index , bone mineral content , zoology , osteoporosis , biology
Dietary protein is an important determinant of bone health, but the effect of dietary total protein intake (Tpro) on bone status of older adults is controversial. We assessed the effect of TPro on bone status using data from the 1999–2004 NHANES. Dietary (24‐h recall) and bone (DXA) data from 6,149 men and women aged 50+ y were analyzed. Subjects were grouped based on TPro (LP (n=1993), <0.8; MP (n=1150), 0.8–1.0; and HP (n=3006), >;1.0 g protein·kg ideal body weight (IBW) −1 ·d −1 ). Total‐body bone mineral content (BMC), appendicular BMC (aBMC), total‐body bone mineral density (BMD), and total‐body bone mass index (BoMI) were used as indicators of bone status. Mean protein intakes of LP, MP, and HP were: 0.58±0.004, 0.90±0.002, and 1.45±0.011 g protein·kg IBW −1 ·d −1 , respectively. Compared to the LP, MP and HP had higher BMC (p<0.001), aBMC (p<0.001), and BMD (p<0.001) and HP had higher BoMI (p<0.001). There were no differences between MP and HP for these parameters. After covariate adjustment, HP had higher BMD (1.096 ± 0.003 g/cm 2 vs. 1.085 ± 0.004 g/cm 2 ; p < 0.05) than LP, with MP intermediate (1.094 ± 0.005 g/cm 2 ). These results indicate inadequate protein intake adversely affects bone status in older adults. However, among subjects who consumed adequate protein, i.e. greater than 0.8 g protein·kg IBW −1 ·d −1 , bone status was not influenced by higher protein intake. Funding: Dairy Res Inst, Purdue Ingest Behav Res Ctr