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Lack of Vitamin D May Increase Type 1 Risk

Cases of type 1 diabetes are rising, and scientists are straining to find out why. One thought is that people are spending less time in the sun, which means they may be deficient in vitamin D. To test this, researchers analyzed blood samples collected between 2002 and 2008 from military service members, 1,000 of whom later developed type 1 diabetes. They found that people who developed type 1 had, on average, lower levels of vitamin D in their blood. Type 1 diabetes is a disease of the immune system, which depends on vitamin D for proper function. This suggests but doesn't prove a relationship between the two conditions.
Source: Diabetologia, December 2012