Alzheimer's risk increased 7 percent for every 4 ng decrease in Vitamin Dā meta-analysis
25-Hydroxyvitamin D Levels and the Risk of Dementia and Alzheimer's Disease: A Dose-Response Meta-Analysis.
Front Aging Neurosci. 2018 Nov 9;10:368. doi: 10.3389/fnagi.2018.00368. eCollection 2018.
Chen H1, Xue W1, Li J1, Fu K1, Shi H2, Zhang B3, Teng W1, Tian L4.
1 Deparment of Neurology, The First Affiliated Hospital, China Medical University, Shenyang, China.
2 Clinical Department one, China Medical University, Shenyang, China.
3 Department of Endodontics, School of Stomatology, China Medical University, Shenyang, China.
4 Department of Geriatrics, Shengjing Hospital, China Medical University, Shenyang, China.
1. Items in BOTH the categories Cognition and Vitamin D Receptor Gene
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1. Items in BOTH the categories Cognition and Omega-3
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1. Items of Cognition and Intervention (give Vitamin D and see what happens)
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1. Items of Cognition and Meta-analysis
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Background and Purpose: Conclusions of previous cohort studies on the relationship between 25-hydroxyvitamin D level and the risk of dementia and Alzheimer's disease were not consistent. Thus, we performed a dose-response meta-analysis to evaluate this relationship by summarizing cohort studies.
Methods: Pubmed, Embase, Cochrane, and Web of Science databases were searched for relevant studies. Cohort studies concerning the association between 25-hydroxyvitamin D level and dementia or Alzheimer's disease were included. Results of studies were pooled and the dose-response relationship was determined using a random-effect model.
Results: Ten cohort studies, with 28,640 participants were included. A significant inverse relationship was found between 25-hydroxyvitamin D level and the risk of dementia and Alzheimer's disease. In addition, we found a linear dose-response relationship in that a 10 nmol/L increase in 25-hydroxyvitamin D level may lead to a 5% decrease in the risk of dementia (relative risk, 0.95; 95% confidence interval, 0.93-0.98) and 7% in the risk of Alzheimer's disease (relative risk, 0.93; 95% confidence interval, 0.89-0.97).
Conclusion: Plasma or serum 25-hydroxyvitamin D concentration was inversely related to the risk of dementia and Alzheimer's disease, consistent with a linear dose-response relationship.