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Related Experiment Videos

Hyperglycaemia and vitamin D: a systematic overview.

G Neil Thomas1, R Scragg, Chao Q Jiang

  • 1Public Health, Epidemiology and Biostatistics, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. gneilthomas@yahoo.co.uk

Current Diabetes Reviews
|February 23, 2012
PubMed
Summary

This systematic review found limited evidence that vitamin D supplementation improves blood sugar control or insulin resistance in adults. More high-quality trials are needed to confirm any potential benefits of vitamin D for diabetes prevention.

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Area of Science:

  • Endocrinology
  • Metabolic Health
  • Nutritional Science

Background:

  • Vitamin D influences numerous bodily functions, potentially affecting glycemic control.
  • Hyperglycemia and insulin resistance are key factors in metabolic disorders like type 2 diabetes.

Purpose of the Study:

  • To systematically review clinical studies on vitamin D's impact on hyperglycemia in non-pregnant adults.
  • To assess the quality of existing research and identify gaps in knowledge regarding vitamin D and glycemic control.

Main Methods:

  • Systematic literature search identifying 1,294 articles, including 417 reviews.
  • Analysis focused on studies evaluating vitamin D's effects on glucose and insulin concentrations.
  • Assessment of study design quality, including sample size, duration, vitamin D dosage, and analytical methods.

Main Results:

  • No well-designed randomized controlled trials were found specifically examining vitamin D supplementation's effects on glucose and insulin.
  • Most available studies were of poor quality, with small sample sizes, short durations, or inadequate vitamin D dosing.
  • Few studies reported improvements in glycemia; results for insulin resistance were equivocal, with some suggesting benefits and others none.
  • While some studies indicated improved insulin release, the data is insufficient for reliable conclusions.

Conclusions:

  • Current evidence from clinical studies is inadequate to definitively conclude whether vitamin D supplementation improves glycemic control or insulin resistance.
  • High-quality, well-conducted randomized controlled trials with appropriate vitamin D dosages are essential.
  • Further research is required to determine if vitamin D can effectively reduce the incidence of type 2 diabetes.