Vitamin D and calcium were thought to assist in preventing cancer, heart disease and other problems, but this has been questioned by a panel of US and Canadian doctors.
After reviewing about 1,000 studies on the supposed links between low vitamin D levels and higher risk of serious diseases, the panel concluded that they showed inconsistent results, sometimes due to shoddy research methods.
The experts also issued new guidelines — the first since 1997 — for North Americ…
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