Calcium, vitamin D may lower diabetes risk

The new study, published in the journal Diabetes Care (Vol. 29, pp. 650-656), used data from the Nurses Health Study, and related the vitamin D and calcium intake of 83,779 registered nurses to the incidence of type-2 diabetes.

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After 20 years of follow-up, during which time dietary and supplementary intakes were measured using validated food frequency questionnaires every two to four years, the authors concluded: “A combined daily intake of more than 1,200 milligrams of calcium and more than 800 international units (IU) of vitamin D was associated with a 33 per cent lower risk of type-2 diabetes."

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Both dietary calcium and supplements were associated with significant decreased risks of type 2 diabetes, with women who had total daily intakes of calcium greater than 1,200 milligrams had a 21 per cent lower risk compared to women who had intakes less than 600 mg per day.

“For both vitamin D and calcium, intakes from supplements rather than from diet were significantly associated with a lower range of type 2 diabetes,” said Pittas.