As an undergrad, I was a nutritional sciences major, which, believe it or not, was insanely tough. We memorized vitamins and recommended daily allowances as well as things like the Krebs Cycle and the structures of the different amino acids. All to understand how the different parts of the body and what we put into it interact. This morning, I came across this article on NPR that looks at a study between vitamin D and bone. The study administered very high doses of vitamin D in the autumn to elderly women at high risk for fractures and falls, and found that the women with the high doses were actually having more falls and fractures!
I was kind of shocked when I read this article, because every class I took in undergrad emphasized that high super-doses of any vitamin was dangerous and low doses over long periods of time were both safer and more effective. On one hand, I'm glad that these researchers have found that to be true, but on the other hand, it shocks me that they didn't already know this.
Huge Vitamin D Doses Appear to Hurt More Than Help