How is vitamin D linked to knee pain?

Knee pain could suggest insufficient vitamin D in the diet.  Having insufficient vitamin D could increase your risk of developing knee osteoarthritis, a condition in which the natural cushioning between joints wears away, allowing bones to rub together. A study using participants who either had knee osteoarthritis or were at risk for it found that those with low vitamin D levels had more than double the risk of their knee osteoarthritis worsening, compared with volunteers who had healthy levels of vitamin D. Health experts recommend that adults age 70 and younger get at least 600 international units (IU) of vitamin D daily; those over 70 should up the amount to 800 IU daily.

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