In exploring the subject of calcium and prostate cancer, the analysis of the data becomes more complicated as more studies are included. Therefore, as an older male with the goal to reduce prostate cancer risk, an approach of maintaining an adequate calcium intake from food is supported by the majority of the research. In absence of deficiency and in presence of an adequate balanced diet, calcium supplements should be avoided by middle aged to older men.
Calcium and breast cancer:
Chung, et al reviewed a number of studies on health outcomes by subjects which consumed calcium and vitamin D. It was found that adequate calcium intakes in premenopausal women was associated with a decreased risk of breast cancer. (14)