Influence of chromium-enriched yeast on blood glucose and insulin variables, blood lipids, and markers of oxidative stress in subjects with type 2 diabetes mellitus

Abstract

The aim of this study was to determine the effect of chromium (Cr)-enriched yeast on blood glucose and insulin variables, blood lipids, and blood markers of oxidative stress in persons with type 2 diabetes mellitus (median duration: 3.0 yr). Thirty-six subjects (9 men, 27 women; mean age: 61.3 yr; mean body mass index: 34.33 kg/m2) were supplemented with 400 μg Cr/d as Cr-enriched yeast (n=19) or placebo (n=17) for 12 wk in a randomized, double-blind study. The most interesting results were obtained by comparison of the change in the placebo group to the change in the Cr group. The Cr group showed a significantly greater increase in serum Cr compared to the placebo group (p<0.05). Supplementation with Cr-enriched yeast was associated with a significant decrease in fasting serum glucose compared to placebo (p<0.01). Blood markers of oxidative stress glutathione peroxidase activity and levels of reduced glutathione were essentially unchanged in the Cr group after 12 wk, but decreased significantly in the placebo group (p<0.05, p<0.01, respectively), Serum HbA1c and glycated protein (fructosamine) were essentially unchanged in the Cr group, whereas HbA1c tended to increase in the placebo group (from 6.94% to 7.11%). Fasting serum insulin decreased in both groups, with a greater tendency in the Cr group (−16.5% vs −9.5%). These data suggest that supplementation of well-controlled type 2 diabetics with Cr-enriched yeast is safe and can result in improvements in blood glucose variables and oxidative stress.

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Correspondence to Jaroslav Racek.

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Racek, J., Trefil, L., Rajdl, D. et al. Influence of chromium-enriched yeast on blood glucose and insulin variables, blood lipids, and markers of oxidative stress in subjects with type 2 diabetes mellitus. Biol Trace Elem Res 109, 215–230 (2006). https://doi.org/10.1385/BTER:109:3:215

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Index Entries

  • Chromium
  • diabetes mellitus
  • glycated hemoglobin
  • insulin
  • oxidative stress
  • yeast