The current RDA for magnesium is 310-320 milligrams (mg) for adult women, and 400-420 mg for adult men. Average intake among Americans tends to lag about 100 mg below these recommended levels. Those most likely to have low blood levels include the elderly and those who take diuretic medications, which increase the excretion of magnesium. The best food sources of magnesium are green leafy vegetables, whole grains, nuts and dried beans.
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