David S Wald1, Anuradhani Kasturiratne, Mark Simmonds. 1. Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine, Queen Mary University of London, London, UK. d.s.wald@qmul.ac.uk
Abstract
PURPOSE: We aimed to quantify the effect of folic acid supplementation on the prevention of cognitive decline. METHODS: We conducted a meta-analysis of 9 placebo-controlled randomized trials (2835 participants, median duration 6 months) of folic acid, with or without other B vitamins, on cognitive function. Standardized mean differences in cognitive function test scores were calculated between folic acid and placebo-treated groups. RESULTS: The standardized mean difference in cognitive function test scores was 0.01 (95% confidence interval [95% CI], -0.08 to 0.10), or an increase of 1% (95% CI, -8% to 10%) of 1 standard deviation. The results were similar within each of the 4 categories of cognitive function (memory, speed, language, and executive function); standardized mean differences were 0.01 (95% CI, -0.08 to 0.09), -0.01 (95% CI, -0.10 to 0.13), -0.05 (95% CI, -0.15 to 0.04), and 0.03 (95% CI, -0.13 to 0.19), respectively. CONCLUSION: Randomized trials show no effect of folic acid, with or without other B vitamins, on cognitive function within 3 years of the start of treatment. Trials of longer duration, recording the incidence of dementia, as well as cognitive decline, are needed. Copyright 2010 Elsevier Inc. All rights reserved.
PURPOSE: We aimed to quantify the effect of folic acid supplementation on the prevention of cognitive decline. METHODS: We conducted a meta-analysis of 9 placebo-controlled randomized trials (2835 participants, median duration 6 months) of folic acid, with or without other B vitamins, on cognitive function. Standardized mean differences in cognitive function test scores were calculated between folic acid and placebo-treated groups. RESULTS: The standardized mean difference in cognitive function test scores was 0.01 (95% confidence interval [95% CI], -0.08 to 0.10), or an increase of 1% (95% CI, -8% to 10%) of 1 standard deviation. The results were similar within each of the 4 categories of cognitive function (memory, speed, language, and executive function); standardized mean differences were 0.01 (95% CI, -0.08 to 0.09), -0.01 (95% CI, -0.10 to 0.13), -0.05 (95% CI, -0.15 to 0.04), and 0.03 (95% CI, -0.13 to 0.19), respectively. CONCLUSION: Randomized trials show no effect of folic acid, with or without other B vitamins, on cognitive function within 3 years of the start of treatment. Trials of longer duration, recording the incidence of dementia, as well as cognitive decline, are needed. Copyright 2010 Elsevier Inc. All rights reserved.
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