People who take vitamin D supplements in the belief that they protect against heart disease and cancer may be wasting their time, a study suggests.
Scientists who conducted a review of hundreds of studies argued that some health benefits attributed to vitamin D were the result of a “chicken and egg” misunderstanding.
Low vitamin D levels were not a cause of chronic conditions such as heart disease, diabetes and cancer but a result of them, they concluded.
The finding challenges the view of many experts — including conventional doctors as well as alternative practitioners — that the vitamin plays a major role in disease prevention.
It is well known that vitamin D promotes the uptake of calcium and bone formation, The extent to which reduces the risk of other major causes of ill-health is less clear.
The scientists found results from prospective observational studies and randomly controlled trials did not tally.
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