Calcium, eaten in foods or taken as supplements, has little or no effect on bone density or the risk of fracture in people over 50, according to two large reviews of studies in BMJ.

One analysis reviewed 59 randomized controlled trials of the effect of dietary and supplemental calcium on bone density. Together, the trials included 13,790 men and women over 50. The data showed that more calcium in the diet or taken as supplements increased bone density about 1 percent to 2 percent — too little to have any effect on fractures.

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Jeffrey R. Ungvary President