Folic acid supplementation on inflammation and homocysteine in type 2 diabetes mellitus: systematic review and meta-analysis of randomized controlled trials

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Abstract

Background: The beneficial effects of folate have been observed under different conditions, but the available evidence on inflammation and reduction of cardiovascular disease (CVD) in type 2 diabetes mellitus (T2DM) is limited. The study aimed to explore the effects of folate on inflammation and homocysteine amongst individuals with T2DM. Methods: PubMed, Scopus, and Cochrane Library were used to search for evidence. A random-effect model meta-analysis through Review Manager (version 5.4) and metaHun was performed. Results were reported as standardized mean differences (SMD) and 95% confidence intervals graphically using forest and funnel plots. Results: Data from 9 trials with 426 patients living with T2DM were analyzed. Folic acid supplementation significantly revealed a large effect size on homocysteine levels compared to placebo, SMD = −1.53, 95%CI (−2.14,−0.93), p < 0.05. Additionally, we observed a medium marginal effect size on C-reactive protein (SMD = −0.68, 95%CI (−1.34, −0.01), p = 0.05). However, no significant effect on tumor necrosis factor-α (SMD = −0.86, 95%CI (−2.65, 0.93), p = 0.34), and interleukin-6 (SMD = −0.04, 95%CI (−1.08, 1.01), p = 0.95) was observed. Conclusion: Evidence analyzed in this study suggests that folic acid supplementation in T2DM reduces homocysteine and may mitigate CVDs. However, its effect on inflammation is inconclusive.

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Mokgalaboni, K., Mashaba, G. R., Phoswa, W. N., & Lebelo, S. L. (2024, December 1). Folic acid supplementation on inflammation and homocysteine in type 2 diabetes mellitus: systematic review and meta-analysis of randomized controlled trials. Nutrition and Diabetes. Springer Nature. https://doi.org/10.1038/s41387-024-00282-6

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