[Calcium requirement for the maintenance of bone mass].
The bone mineral density of middle-aged and elderly people is determined by the peak bone mass obtained in the adolescent period and the bone loss in the later stage of life. The rapid bone loss observed in the postmenopausal women is largely explained by estrogen deficiency. On the other hand, aging-dependent decrease of bone mass commonly seen in women and men may be attributed to the change in calcium metabolism. In Japan, the calcium intake would be less than the amount sufficient to keep positive calcium balance and to maintain bone mass.
Hosoi
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Calcium Requirement for the Maintenance of Bone Mass.