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 .
The impact of dietary protein on calcium absorption and kinetic measures of bone turnover in women.
Although high-protein diets induce hypercalciuria in humans , the source of the additional urinary calcium remains unclear . One hypothesis is that the high endogenous acid load of a high-protein diet is partially buffered by bone , leading to increased skeletal resorption and hypercalciuria . We used dual stable calcium isotopes to quantify the effect of a high-protein diet on calcium kinetics in women . The study consisted of 2 wk of a lead-in , well-balanced diet followed by 10 d of an experimental diet containing either moderate ( 1.0 g/kg ) or high ( 2.1 g/kg ) protein .  Thirteen healthy women received both levels of protein in r and om order . Intestinal calcium absorption increased during the high-protein diet in comparison with the moderate ( 26.2 + /- 1.9 % vs. 18.5 + /- 1.6 % , P < 0.0001 , mean + /- sem ) as did urinary calcium ( 5.23 + /- 0.37 vs. 3.57 + /- 0.35 mmol/d , P < 0.0001 , mean + /- sem ) . The high-protein diet caused a significant reduction in the fraction of urinary calcium of bone origin and a nonsignificant trend toward a reduction in the rate of bone turnover . There were no protein-induced effects on net bone balance . These data directly demonstrate that , at least in the short term , high-protein diets are not detrimental to bone
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 .