a very large study of 26,000 men and women that asked if vitamin D helps to prevent bone fractures, as many people believe.that people who took vitamin D had exactly the same risk of bone fractures as those who didn’t. It didn’t matter how much vitamin D they took, nor did it help if they also took supplemental calcium: either way, vitamin D had no effect., that followed over 36,000 older women, looking at the effects of a combination of vitamin D and calcium over a 22-year period.
Over the course of 22 years, 1817 women taking supplements died of cancer, compared to 1943 women in the placebo group who died of cancer. That sounds kind of good, right? The study authors report that this result – 126 fewer deaths – was statistically significant , but there are good reasons to be skeptical of this “significance” claim.
Combining both causes of death, we see that in the women taking supplements, there were 75 more deaths from either cancer or heart disease. The study also reported numbers for all causes of death, and there were still very slightlydeaths in the supplement group. Why would supplemental vitamin D and calcium increase the rate of heart disease, or decrease the rate of cancer? Well, first I should emphasize that it’s entirely possible that these supplements have no effect at all, and the difference in death rates must just be random variation. There have been multiple studies speculating on how vitamin D might help to prevent cancer, but the effect, if any, is very small.
Source: Education Headlines (educationheadlines.net)
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