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Folic acid supplementation improves cognitive function by reducing the levels of peripheral inflammatory cytokines in elderly Chinese subjects with MCI

Ma F, Wu T, Zhao J, Song A, Liu H, Xu W, Huanga G (2016) Sci Rep.  2016; 6:  37486. Published online 2016 Nov 23. doi: 10.1038/srep37486 

Web URL: Read this and related abstracts on PubMed here

Abstract:

This study aimed to evaluate whether folic acid supplementation would improve cognitive performance by reducing serum inflammatory cytokine concentrations. This RCT was performed in Tianjin, China.

Participants with mild cognitive impairment (MCI) were randomly assigned to the folic acid (400 μg/day) or conventional treatment groups. Neuropsychological tests were administered, and folate, homocysteine, vitamin B12, IL-6, TNF-α, Aβ-42, and Aβ-40 were measured at baseline and at 6- and 12-month time points.152 participants (folic acid: 77, conventional: 75) completed the trial. Significant improvements in folate (ηp2 = 0.703, P = 0.011), homocysteine (ηp2 = 0.644, P = 0.009), Aβ-42 (ηp2 = 0.687, P = 0.013), peripheral IL-6 (ηp2 = 0.477, P = 0.025), TNF-α (ηp2 = 0.709, P = 0.009) levels were observed in folic acid group compared with conventional group.

Folic acid supplementation improved the Full Scale Intelligence Quotient (P = 0.028; effect size d = 0.153), Information (P = 0.031; d = 0.157) and Digit Span (P = 0.009; d = 0.172) scores at 12 months compared with conventional treatment.

Based on these findings, daily oral administration of a 400-μg folic acid supplement to MCI subjects for 12 months can significantly improve cognitive performance and reduce peripheral inflammatory cytokine levels.

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