New Study Casts Doubt on Vitamin D's Disease Prevention Ability

Researchers cast doubt on the prevailing wisdom that vitamin D supplements can prevent conditions like cancer, diabetes and heart disease, saying on Friday that low levels of vitamin D may be a consequence, not a cause, of ill health.   The findings, published in The Lancet Diabetes & Endocrinology journal, could have implications for millions of people who take vitamin D pills and other supplements to ward off illness; Americans spend an estimated $600 million a year on them...

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