It says in my life science diabetes can be caused by low vitamin D levels( you absorb some vitamin d from the sun, thats what its talking about.) It says: -Prevention of Diabetes Unusally low vitamin d levels lead to reduced insulin secretion and slow the bodies ability to use insulin. Of course, they don't say T1 or T2. I know this isnt why I got diabetes, I get too much sun. I have never heard of this before.