Another reason to take a vitamin D supplement!
A study published this month found that 59% of the 90 females tested, aged 16-22 and residing in California, were deficient in vitamin D. That’s an astounding statistic considering that girls this age should be drinking milk or milk-based products and therefore getting a decent amount of vitamin D daily. Plus they live in a state that gets more sunshine then most other states in the U.S.!
Not only were these girls deficient but, the ones with low vitamin D had more fat in their muscle. This study found that serum levels of vitamin D were inversely related to the percent of fat in skeletal muscle. Lower vitamin D levels = fatty muscle. What’s the link between low vitamin D and more muscle fat? At this time scientists don’t know. However, we do know that intramuscular fat isn’t good because it decreases muscle strength. In another study that measured strength in adolescent girls, blood levels of vitamin D were correlated to muscle power, force, velocity and jump height.
Combined, these studies show yet another function of vitamin D – it is important for proper muscle functioning.
References
J Clin Endocrin Metab 2010;95:1-7.
J Clin Endocrin Metab 2009; 94:559-563.
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