Can sunshine prevent Type 2 diabetes?
https://www.diabetes.org.uk/About_us/News/Can-sunshine-prevent-Type-2-diabetes/

Lack of sunshine increases the risk of diabetes MORE than being obese
https://www.dailymail.co.uk/health/article-2965410/Lack-sunshine-increases-risk-diabetes-obese-Low-level-vitamin-D-plays-major-role-disease.html

Vitamin D and Its Role in Diabetes
https://www.diabetesdaily.com/blog/vitamin-d-and-its-role-in-diabetes-402285/

What Vitamin D Is Good for When You Have or Are at Risk for Diabetes
https://www.everydayhealth.com/type-2-diabetes/diet/vitamin-d-deficiency-linked-with-diabetes/