Vitamin D and insulin sensitivity

Vitamin D appears to be connected to insulin sensitivity. A study investigating the connection between white skinned and African American women exploring the effect of vitamin D levels on insulin sensitivity.

African Americans are more sensitive to sugar (higher insulin sensitivity) therefore they have great chance of developing insulin resistance (type two diabetes) because their "tolerance" for sugar/high GI foods is lower. Given the same environmental conditions darker skinned people will have lower vitamin D levels as the melanin in their skin prevents the production of vitamin D.

What the study found was the lower the vitamin D the higher the insulin sensitivity in the healthy women. This indicates that higher vitamin D levels could well be associated with reduced chance of type two diabetes (insulin resistance).