The 4-Hour Body - An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferriss
One NFL player I ended up treating had experienced debilitating shoulder pain for years
and had two surgeries as a result, all to little or no e ect. Upon testing his vitamin D
levels, it became clear that he was severely de cient. Six weeks after taking vitamin D, his
shoulder pain was nonexistent. He had two surgeries for no reason.
Vitamin D, it turns out, does a lot more than most vitamins.
Once vitamin D is activated within the body as calcitriol, it acts as a steroid hormone and
regulates more than 1,000 vitamin Dresponsive genes, including those that code for speci c
muscle bers. It can increase the size and number of type 2 (fast-twitch) bers, which, as
indicated earlier, have the greatest potential for growth. It is one of the most overlooked
"sleeper nutrients," according to John Anderson, professor emeritus of nutrition at the
University of North Carolina.
The e ect can be substantial
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