Low levels of Vitamin D are associated with Type 1 Diabetes and poor control of blood glucose levels.
It is possible that Vitamin D is a significant contributor to blood glucose control and pancreatic cell damage.
This ties in with my Nutritional Model of Inflammation and Modern Disease. Vitamin D has an effect on the clearance of small dense LDL (bad cholesterol) particles after a fructose load. Low levels will be associated with more inflammation.
I wonder if decades of low fat intake and avoiding sunshine are contributing to our health issues.
In the meantime, getting outside and being active seems like a good idea. My answer being fair skinned is keeping the hat on but baring a bit of flesh each day. How long depends on the season and the time of day. Don’t get burnt.
The Nutritional Model of Modern Disease is at http://www.nofructose.com/…/nutritional-model-of-modern-di…/
More info at https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/ but skip the last bit about a ‘healthy diet’.