Vitamin D and Risk of Cognitive Decline in Elderly Persons

The findings of a report published in 2007 suggested that over 40% of older, community-living adults in the United States and Europe were vitamin D deficient. There is clinical evidence for a relationship between low serum 25-hydroxyvitamin D (25[OH]D) levels and cognitive dysfunction with aging. Although data in several small clinical studies showing such an association were equivocal, 3 of 4 large population-based cross-sectional studies...