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I heard that a marathon is not healthy for anyone. Too much hard work at once compared to other exercise choices. Your body can only handle so much exertion at once, so what your doc said matches what I have read.
Journal of the American Medical Association, looked at 322 healthy
adults in New Zealand and found that those who took large monthly doses
of vitamin D developed just as many infections over an 18-month period
as those who took a placebo
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