Supplementation with a combination of antioxidants does not affect glycaemic control, oxidative stress or inflammation in type 2 diabetes subjects

Free Radic Res. 2010 Dec;44(12):1445-53. doi: 10.3109/10715762.2010.515219. Epub 2010 Oct 13.

Abstract

The present clinical trial examined the influence of a supplement, containing a combination of antioxidants extracted from fruit, berries and vegetables, on levels of plasma antioxidants (tocopherols, carotenoids and ascorbate), glycaemic control (blood glucose, HbA1c, insulin), oxidative stress biomarkers (F(2)-isoprostane, malondialdehyd, nitrotyrosine, 8-oxo-7, 8-dihydro-2'-deoxyguanosine, formamidopyrimidine glycosylase sites, frequency of micronucleated erythrocytes) and inflammatory markers (interleukin-6, C-reactive protein, prostaglandin F(2α)-metabolite) in type 2 diabetes. Forty subjects were randomly assigned to control, single or double dose group and completed the study. In summary, 12 weeks of antioxidant supplementation did neither affect glycaemic control nor the levels of biomarkers of oxidative stress or inflammation, despite substantially increased plasma concentrations of antioxidants. The absence of an effect may be explained by the selected study subjects with relatively well-controlled diabetes, a high intake of fruit and vegetable and levels of plasma antioxidants, biomarkers of oxidative stress and inflammatory markers comparable to those found in healthy subjects.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antioxidants / pharmacology
  • Antioxidants / therapeutic use*
  • Biomarkers, Pharmacological / blood
  • Blood Glucose / analysis
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Diabetes Mellitus, Type 2 / metabolism
  • Dietary Supplements*
  • Double-Blind Method
  • Female
  • Glycated Hemoglobin A / analysis
  • Humans
  • Inflammation / prevention & control
  • Insulin / blood
  • Male
  • Middle Aged
  • Oxidative Stress

Substances

  • Antioxidants
  • Biomarkers, Pharmacological
  • Blood Glucose
  • Glycated Hemoglobin A
  • Insulin