Frontiers in Nutrition (Oct 2024)

The prevention and improvement effects of vitamin D on type 2 diabetes mellitus: evidence from an umbrella review on Meta-analyses of cohort studies and randomized controlled trials

  • Le Cheng,
  • Chenhui Lv,
  • Lushan Xue,
  • Cheng Zhang,
  • Lili Wang,
  • Xi Wang,
  • Shuangzhi Chen,
  • Xuemin Li,
  • Wenjuan Feng,
  • Haoran Xie,
  • Haifeng Zhao,
  • Haifeng Zhao

DOI
https://doi.org/10.3389/fnut.2024.1462535
Journal volume & issue
Vol. 11

Abstract

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BackgroundTo clarify whether Vitamin D prevent the occurrence of type 2 diabetes mellitus (T2DM) and improve glucose control in T2DM patients, we conducted this umbrella review, taking into account the inconsistent results of existing Meta-analyses. We aim to reveal the causal relationship between Vitamin D and T2DM through summarizing Meta-analyses of observational studies, and clarify the improvement on glucose control in T2DM patients through summarizing Meta-analyses of RCT studies between Vitamin D supplementation and T2DM patients, especially in T2DM patients with Vitamin D deficiency.MethodsWe collected the Meta-analyses of observational studies and RCTs in PubMed, Scopus, Embase, Web of Science, and Cochrane.Results16 Meta-analyses (6 effect sizes for cohort studies and 10 effect sizes for RCTs) were included in the umbrella Meta-analyses. Random-effects model was carried out to calculate the pooled point estimates and their respective 95% confidence intervals (CI). The results revealed that lower 25(OH)D levels increased the risk of T2DM (Pooled ESRR = 1.34; 95%CI: 1.16, 1.53), Vitamin D supplementation ameliorated FBG (ES = −0.56; 95%CI: −1.00, −0.11), HbA1c (ES = −0.11; 95%CI: −0.20, −0.02), insulin (ES = −0.38; 95%CI: −0.59, −0.18) and HOMA-IR (ES = −0.37; 95%CI: −0.57, −0.16) in T2DM patients, especially in those with Vitamin D deficiency (FBG = −0.98; HbA1c = −0.27; HOMA-IR = −0.52).ConclusionThe present umbrella Meta-analyses demonstrates the potential benefits of higher serum Vitamin D levels and Vitamin D supplementation in reducing the development and symptoms of T2DM.

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