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Vitamin D reduces cognitive decline

Doctors in this study measured vitamin D levels and cognitive performance in 6,257 older woman still living independently in their communities. Women with the lowest levels of vitamin D–10 to 25 nanograms per milliliter of blood (ng/mL)–were much more likely to be cognitively impaired than women with 30 to 74 ng/mL of vitamin D.

Four years later, doctors found that women with less than 20 ng/mL of vitamin D were much more likely to have experienced cognitive decline compare to the start of the study, while women with higher vitamin D levels were much more likely to have maintained cognitive function.

Low vitamin D levels linked to Alzheimer’s disease

In this study, doctors measured vitamin D in the diets of 498 women who were not taking vitamin D supplements and who did not have¬†Alzheimer’s disease (AD) or other dementias at the start of the study. After seven years of follow-up, researchers divided the women into three groups; those who had developed AD, those who had developed other dementias, and those who had not developed dementia.

Doctors found a direct link: as levels of vitamin D increased, chances of developing AD decreased. Women who got the most vitamin D–the top 20 percent–were 77 percent less likely to develop AD compare to all other women who got lower amounts of vitamin D.

Reference: The Journals of Gerontology Series A: Biological Sciences and Medical Sciences; 2012, Vol. 67, No. 10, 1092-8

From the March 2012 newsletter

Van's Health on April - 22 - 2013
categories: Vitamins

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