If this were the case, why in my immediate family as well as extended family I am the only one with MS. I am pretty sure that my 9 brothers and sisters grew up in the same environment I did. LOL

With 10 kids all about a year apart, we were outside all the time except in rain. Cloudy days, snow, sunshine, whatever my mom took every opportunity to have us all outside as much as possible. Do you blame her? LOL

The article does say an environmental risk factor, however, there has to be more than just the vitamin D factor to trigger the MS.

I have often wondered if lack of saturated fats in our mom's breast milk has something to do with us getting MS. Breast milk is fatty (appx 50% fat) but that fat helps build healthy myelin in babies. To me, that seems more of a viable risk factor than the vitamin D theory.