Article The Bone—Vasculature Axis: Calcium Supplementation and the R...
This is an informative article on the physiology of bone restructuring through dietary supplementation. One of the assumptions is that "The pattern of sex hormonal secretion drastically changes after the menopause, resulting in disbalance in bone turnover markers...". I posit that estrogen reduction reduces muscle mass that signals bone loss - see: "Muscle and Bone Mass Loss in the Elderly Population: Advances in diagnosis and treatment " : http://www.jbiomed.com/v03p0040.htm