I first heard about this last year after elite marathoner Deena Kastor found that she had a Vitamin D deficiency. She ended up breaking a bone in the Beijing O

I first heard about this last year after elite marathoner Deena Kastor found that she had a Vitamin D deficiency. She ended up breaking a bone in the Beijing Olympics. It turned out that she had plenty of calcium, but was deficient in Vitamin D from overusing sunscreen. http://runningtimes.com/Article.aspx?ArticleID=16940 http://runningtimes.com/Article.aspx?ArticleID=16940 Luckily the solution for most of us is to just go outside for 15 minutes and enjoy the sun!