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 .
Milk supplementation and bone health in young adult chinese women.
BACKGROUND Milk is potentially beneficial for bone health , particularly for Chinese population s where consumption of dairy products is low . There are few data about milk consumption by Chinese women aged 20 - 35 years . This study examines whether milk supplement over 2 years caused increased bone mineral density ( BMD ) in Chinese women aged 20 - 35 years . METHODS Four hundred forty-one community-living women living in Hong Kong SAR ( 221 ) and Beijing ( 220 ) China were r and omized to receive milk supplement or nothing .  The supplement consisted of two sachets of milk powder ( 1000 mg calcium , 80 microg vitamin K(1 ) ) , for 24 months . BMD at total hip , total spine , and whole body was measured at baseline and at 6 , 12 , 18 , and 24 months ; blood specimens were analyzed at baseline and at 3 and 24 months for biochemical indices of bone turnover and vitamin K. Urine sample s also were collected . Analysis was by intention to treat as well as per protocol . Differences in change from baseline between the milk and control groups were analyzed using the mixed models approach to repeated measures , including the baseline value as a covariate . RESULTS Both groups had an increase in BMD and a decrease in bone turnover markers over time , as an indicator of the process of attainment of peak bone mass during this period . Apart from a higher total spine BMD at 6 months in the milk group using per protocol analysis , there was little significant difference observed between the milk group and the control group . CONCLUSIONS Age-related bone metabolism and lack of compliance most likely explain the lack of consistent changes in BMD or bone biochemical measures in response to milk supplementation for 2 years in Chinese women aged 20 - 35 years
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 .