With fewer adults drinking milk and being more prudent about exposing their skin to the rays of the sun, vitamin D deficiency is almost an epidemic. Now there is one more reason to start supplementing: Vitamin D can help your muscles. Radiologists at the University of Southern California scanned the muscles of 90 young athletes and found that those with the lowest levels of vitamin D in their blood had the most fat deposits within their muscles. Fatty muscles tend to be less strong and less responsive to insulin. Low levels of vitamin D have also been associated with higher levels of belly fat. Vitamin D may not be as sexy as creatine or a preworkout, but it is slowly proving to be one of the most valuable supple- ments you can take.
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