In older people with osteoporosis , higher protein intake ( ≥ 0.8-g/kg body weight/day , i.e. , above the current RDA ) is associated with higher BMD , a slower rate of bone loss , and reduced risk of hip fracture , provided that dietary calcium intakes are adequate .
Intervention with dietary protein supplements attenuate age-related BMD decrease and reduce bone turnover marker levels , together with an increase in IGF-I and a decrease in PTH .
There is no evidence that diet-derived acid load is deleterious for bone health .
Thus , insufficient dietary protein intakes may be a more severe problem than protein excess in the elderly .
A summary of systematic review s and meta-analyses addressing the benefits and risks of dietary protein intakes  for  bone health in adults suggests that dietary protein levels even above the current RDA may be beneficial in reducing bone loss and hip fracture risk , provided calcium intakes are adequate .
Several systematic review s and meta-analyses have addressed the benefits and risks of dietary protein intakes for bone health in adults .
Adequate supplies of dietary protein are required for optimal bone growth and maintenance of healthy bone .
Variation in protein intakes within the “ normal ” range accounts for 2–4 % of BMD variance in adults .
Inhibition of markers of bone resorption by consumption of vitamin D and calcium-fortified soft plain cheese by institutionalised elderly women.
Acceleration of bone remodelling increases the risk of fragility fractures . The objective of the present study was to explore in elderly women whether a vitamin D and Ca-fortified dairy product providing about 17 - 25 % of the recommended intakes in vitamin D , Ca and proteins would reduce secondary hyperparathyroidism and bone remodelling in a way that may attenuate age-related bone loss in the long term . Thirty-seven institutionalised women , aged 84.8 ( sd 8.1 ) years , with low serum 25-hydroxyvitamin D ( 5.5 ( sd 1.7 ) ng/ml ) were enrolled into a multicentre open trial to consume during 1 month two servings of soft plain cheese made of semi-skimmed milk providing daily 686 kJ ( 164 kcal ) , 2.5 microg vitamin D , 302 mg Ca and 14.2 g proteins . The primary endpoint was the change in serum carboxy terminal cross-linked telopeptide of type I collagen ( CTX ) , selected as a marker of bone resorption . Thirty-five subjects remained compliant . Mean serum changes were : 25-hydroyvitamin D , + 14.5 % ( P = 0.0051 ) ; parathyroid hormone ( PTH ) , - 12.3 % ( P = 0.0011 ) ; CTX , - 7.5 % ( P = 0.01 ) ; tartrate-resistant acid phosphatase isoform 5b ( TRAP 5b ) , - 9.9 % ( P < 0.0001 ) ; albumin , + 6.2 % ( P < 0.0001 ) ; insulin-like growth factor-I (IGF-I),+16.9 % ( P < 0.0001 ) ; osteocalcin , + 8.3 % ( P = 0.0166 ) ; amino-terminal propeptide of type 1 procollagen (P1NP),+19.3 % ( P = 0.0031 ) . The present open trial suggests that fortified soft plain cheese consumed by elderly women with vitamin D insufficiency can reduce bone resorption markers by positively influencing Ca and protein economy , as expressed by decreased PTH and increased IGF-I , respectively . The rise in the bone formation marker P1NP could be explained by a protein-mediated increase in IGF-I. Thus , such a dietary intervention might uncouple , at least transiently , bone resorption from bone formation and thereby attenuate age-related bone loss
In older people with osteoporosis , higher protein intake ( ≥ 0.8-g/kg body weight/day , i.e. , above the current RDA ) is associated with higher BMD , a slower rate of bone loss , and reduced risk of hip fracture , provided that dietary calcium intakes are adequate .
Intervention with dietary protein supplements attenuate age-related BMD decrease and reduce bone turnover marker levels , together with an increase in IGF-I and a decrease in PTH .
There is no evidence that diet-derived acid load is deleterious for bone health .
Thus , insufficient dietary protein intakes may be a more severe problem than protein excess in the elderly .
A summary of systematic review s and meta-analyses addressing the benefits and risks of dietary protein intakes  for  bone health in adults suggests that dietary protein levels even above the current RDA may be beneficial in reducing bone loss and hip fracture risk , provided calcium intakes are adequate .
Several systematic review s and meta-analyses have addressed the benefits and risks of dietary protein intakes for bone health in adults .
Adequate supplies of dietary protein are required for optimal bone growth and maintenance of healthy bone .
Variation in protein intakes within the “ normal ” range accounts for 2–4 % of BMD variance in adults .