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 effects of a 30-month dietary intervention on bone mineral density: the Postmenopausal Health Study.
Low dietary Ca intake and vitamin D insufficiency have been implicated as part of the aetiology leading to osteoporosis . The aim of the present study was to examine the effects of a 30-month dietary intervention that combined supplementation of dairy products fortified with Ca and vitamin D3 and lifestyle and nutrition counselling sessions on  bone mineral density ( BMD )  of postmenopausal women . Sixty-six postmenopausal women ( aged 55 - 65 years ) were r and omised into a dietary group ( DG ; n 35 ) , receiving daily and for the first 12 months 1200 mg Ca and 7.5 microg vitamin D3 , while for the next 18 months of intervention 1200 mg Ca and 22.5 microg vitamin D3 through fortified dairy products , and a control group ( CG ; n 31 ) receiving neither counselling nor dairy products . The DG was found to have more favourable changes in arms ( P < 0.001 ) , total spine ( P = 0.001 ) and total body BMD ( P < 0.001 ) compared with the CG . Furthermore , a significant increase was observed for the DG in lumbar spine BMD ( 0.056 ; 95 % CI 0.009 , 0.103 ) , which was not found to differentiate significantly compared with the change observed in the CG ( P = 0.075 ) . In conclusion , the present study showed that intakes of vitamin D of about 22.5 microg/d and of Ca close to the recommended level of 1200 mg from fortified dairy foods for 30 months , with compliance ensured by lifestyle and nutrition counselling sessions , can induce favourable changes in arms , total spine and total body BMD of postmenopausal women
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 .