Source: Tufts Univ. Health & Nutrition Letter
Summary:
Vitamin D may be crucial to muscle function
In the elderly, vitamin D shortfall is primarily felt in the legs, causing difficulty in climbing stairs or getting out of a chair
Research is in progress to see if vitamin D deficiencies may be causing fatigue in younger people as well
Conclusion: Until the research is in, cover yourself by getting these minimums: 200 units/day through age 50; over 50, 800-1000 units (food and supplements)
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