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 .
Consumption of vitamin D-and calcium-fortified soft white cheese lowers the biochemical marker of bone resorption TRAP 5b in postmenopausal women at moderate risk of osteoporosis fracture.
The prevention of increased bone remodeling in postmenopausal women at low 10-y risk of osteoporotic fractures essentially relies on reinforcement of environmental factors known to positively influence bone health , among which nutrition plays an important role . In institutionalized women in their mid-eighties , we previously found that consumption of fortified soft plain cheese increased vitamin D , calcium , and protein intakes , reduced bone resorption biochemical markers , particularly the serum bone specific acid phosphatase tartrate resistant acid phosphatase , isoform 5b ( TRAP 5b ) that reflects osteoclast activity , and stimulated the serum bone anabolic factor insulin-like growth factor-I ( IGF-I ) . Whether these effects occur in much younger women was tested in a prospect i ve control study . Seventy-one healthy postmenopausal women aged 56.6 ± 3.9 y ( mean ± SD ) with low spontaneous supply of both Ca and vitamin D were r and omized to consume daily ( treated , n = 36 ) or not ( controls , n = 35 ) two servings ( 2 × 100 g ) of skimmed-milk , soft plain cheese for 6 wk . The vitamin D and Ca-fortified dairy product provided daily : 661 kJ , 2.5 μg vitamin D , 400 mg calcium , and 13.8 g protein . At the end of the intervention , the decrease in TRAP 5b and the increase in IGF-I were greater in the treated than in the control group ( P < 0.02 ) . The changes in serum carboxy terminal crosslinked telopeptide of type I collagen did not differ significantly between the two groups . In conclusion , like in elderly women , consumption by healthy postmenopausal women of a vitamin D and calcium-fortified dairy product that also increases the protein intake , reduces the serum concentration of the bone resorption biomarker TRAP 5b . This response , combined with the increase in serum IGF-I , is compatible with a nutrition-induced reduction in postmenopausal bone loss rate
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 .