New research supports link between low vitamin D levels and increased Alzheimer’s risk

Researchers followed over 1,500 healthy elderly people for nearly six years and found that those with persistently low levels of vitamin D were up to 2.4 times more likely to develop Alzheimer’s compared to people with normal vitamin D levels.  The commonly accepted definition of vitamin D deficiency is a level below 30 nanomoles per liter, although this study used a level below 50 as a threshold.

While this study strengthens the association between low vitamin D and dementia risk, the researchers could not definitively rule out a phenomenon called “reverse causality,” meaning it is possible that low vitamin D levels did not cause the dementia and were associated with an increased risk in certain people for other reasons.  If that’s true, then vitamin D may not protect against Alzheimer’s even if low vitamin D levels predict decline. 

Read the Cognitive Vitality report on vitamin D for an overview of the evidence surrounding the link between vitamin D levels and dementia. 

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The content in Cognitive Vitality is intended solely for informational purposes. IT IS NOT INTENDED TO PROVIDE, AND DOES NOT PROVIDE, ANY MEDICAL ADVICE. IT DOES NOT RECOMMEND OR ENDORSE ANY SPECIFIC ACTIONS OR COURSE OF CONDUCT. Neither the Alzheimer’s Drug Discovery Foundation nor the authors and editors of Cognitive Vitality recommend or endorse any of the drugs, supplements, foods, products, or other choices that may be mentioned or described in this website. We encourage you to consult with your own healthcare providers when making decisions regarding your health.

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