Whoa. This is interesting. I've not been told I have a vitamin D deficiency ... yet.
There is some correlation between Vitamin D and lower rates of cancer. Enough so that I think the AMA actually recommends some limited sun exposure for most people (those not those prone to skin cancers).
The fact that age seems to bring on a vitamin D deficiency makes me wonder if that is a factor in the increased cancer rates as we age.
Sounds ripe for a clinical trial!
http://well.blogs.nytimes.com/2012/0...-on-vitamin-d/