the vitamin d issue is rather complex. large observational studies indicate that folks with low vitamin d levels are at greater risk for type 2 diabetes osteoporosis and a whole host of medical problems. it is very difficult to know whether this is due to a true cause and effect relationship (low vitamin d helping to cause type 2 diabetes) or whether this association is due to confounding factors such that low vitamin d levels are just an indicator of poor health status or suboptimal lifestyle habits. . so far i have not been recommending vitamin d for people who have normal levels and i have supported supplementation or sunshine for people with low levels.
can low levels of vitamin d lead to diabetes?