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- W4205214942 abstract "Abstract Background Elevation of homocysteine levels is a well‐established risk factor for dementia, yet controversy exists regarding whether B‐vitamin‐mediated reduction of homocysteine levels can benefit cognitive function. We aimed to investigate whether B vitamins can reduce the risk of cognitive decline and incident dementia. Method PubMed, EMBASE, Cochrane Library, and Web of Science were searched for articles published from the inception dates to March 1, 2020. Studies were eligible if the endpoints included MMSE changes and risk of cognitive decline and/or dementia. Random‐effect or fixed‐effect models, depending on the degree of heterogeneity, were performed to calculate mean differences (MDs), hazard ratios (HRs), and odds ratios (ORs). Result A total of 95 studies with 46175 participants (25 RCTs, 20 cohorts, and 50 cross‐sectional studies) were included. B vitamins can benefit cognitive function as measured by MMSE changes (MD, 0.13, 95% CI 0.04‐0.23), and this result was also significant in studies where placebo groups developed cognitive decline, suggesting that B vitamins slow cognitive decline. For the > 12 months interventional period stratum, B vitamins decreased cognitive decline (MD, 0.15, 95% CI 0.05‐0.25) compared to placebo; no such outcome was detected for the shorter interventional stratum. In the non‐dementia population, B vitamins slowed cognitive decline (MD, 0.15, 95% CI 0.04‐0.25) compared to placebo; this outcome was not found for the dementia population. Lower folate levels (but not B12 or B6) were associated with higher risk of dementia (OR, 1.76, 95% CI 1.24‐2.50) and cognitive decline (OR, 1.26, 95% CI 1.02‐1.55). Among the population without dementia aged 50 years and above, the risk of incident dementia was significantly decreased among individuals with higher intake of folate (HR, 0.61, 95% CI 0.47‐0.78) (but not B12 or B6). Conclusion Our meta‐analysis suggests that B vitamin supplementation is associated with slowing of cognitive decline, especially in populations who received early and long‐term intervention; higher intake of dietary folate is associated with a reduced risk of incident dementia in non‐dementia aged population." @default.
- W4205214942 created "2022-01-25" @default.
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- W4205214942 date "2021-12-01" @default.
- W4205214942 modified "2023-10-17" @default.
- W4205214942 title "B vitamins and prevention of cognitive decline and incident dementia: A systematic review and meta‐analysis" @default.
- W4205214942 doi "https://doi.org/10.1002/alz.050487" @default.
- W4205214942 hasPublicationYear "2021" @default.
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