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ROFLOL, if the majority of it was not hereditary!!!

Just because a disease may have a hereditary predisposition doesn't mean that there aren't controlling factors that determine whether or not it develops. One of those factors may very well be an inherited difficulty in synthesizing vitamin D or an inherited increased rate of turnover or a constitutively low number of vitamin D receptors in certain tissues. Vitamin D has a much broader role than the prevention of vitamin D deficiency disease. The same is true of retinoic acid, though high levels of vitamin A are very toxic. Of course, you could maximize your body's vitamin A with large levels of beta-carotene, which is not toxic like vitamin A and will be converted to vitamin A only to the extent that the body needs it. And, yes, I've got a Ph.D. in Human Nutrition/Nutritional Biology from the University of Chicago.