D is for Diabetes

In this study, researchers analyzed the blood levels of vitamin D of 961 people. After five years, they found that the ones with low levels of vitamin D were 2.6 times more likely to develop type two diabetes, . . . 

while the ones with high levels of vitamin D were 83% less likely to develop type two diabetes. When people had normal levels of vitamin D, they did not develop diabetes.
   Several other studies have also found that vitamin D helps prevent diabetes.

(Clin Nutr 2012;doi:10.1016/j.clnu.2011.12.001)