I was looking for something I read a while ago, the theory was ,
you can get a days dose of vit D by being out in the sun for 30 minutes - sun has to get into your eyes {no sunglasses} { takes longer time in winter due to sun distance and low angle}

I did find this so far -
[What do the following conditions have in common: osteoporosis, multiple sclerosis, high blood pressure, diabetes and cancer? Give up?
Experts suspect that insufficient levels of vitamin D raise your risk of getting these diseases. Unfortunately, most of us probably are vitamin D deficient.]
http://www.motherearthnews.com/Natur...pplements.aspx


I'll just post the google results link - all quite interesting I think...
http://www.google.com/search?hl=en&c...ne&btnG=Search