9 Warning Signs You Are Vitamin D Deficient & How To Fix It
https://www.naturallivingideas.com/9-warning-signs-you-are-vitamin-d-deficient-how-to-fix-it/

Sunshine vitamin can stop diabetes: Boost your health just by going outside
https://www.express.co.uk/life-style/health/560066/Vitamin-D-in-sunshine-can-cut-risk-of-diabetes

Sunshine vitamin looks a little brighter
Study suggests vitamin D could halve the risk of type 1 diabetes
https://news.harvard.edu/gazette/story/2013/02/vitamin_d_study/

The Problems of Vitamin D Insufficiency in Older People
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3501367/

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