In observational studies included in a review in the journal The Lancet Diabetes & Endocrinology, high vitamin D levels were linked to a reduced likelihood of developing diabetes, colon cancer and cardiovascular problems. However, using the vitamin as a treatment did not impact the occurrence or severity of diseases in randomized clinical trials. "What this discrepancy suggests is that decreases in vitamin D levels are a marker of deteriorating health," lead researcher Philippe Autier said.

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