Posted on Oct 06, 2010, 6 a.m.
Bioactive compounds in blueberries increase insulin sensitivity, thereby potentially reducing the risk of diabetes in at-risk individuals.
Blueberries are rich in flavonoids, a type of antioxidant compound, and in-particular the antioxidants known as anthocyanins and flavanols. William T. Cefalu, from Louisiana State University (Louisiana, USA), and colleagues enrolled 32 obese, non-diabetic, and insulin-resistant men and women, average age of 51.5 years and an average BMI of 37.4 kg/m2, in a six-week long study., Subjects either received a smoothie containing 22.5 grams of blueberry bioactives or a placebo blend equal nutritional value. Subjects consumed two smoothies daily for six weeks. At the end of the study, the team found that 67% of subjects who consumed the blueberry smoothie experienced at least a 10% or greater favorable change in insulin sensitivity. The researchers propose that: “Daily dietary supplementation with bioactives from whole blueberries improved insulin sensitivity in obese, nondiabetic, and insulin-resistant participants.”
April J. Stull, Katherine C. Cash, William D. Johnson, Catherine M. Champagne, William T. Cefalu. “Bioactives in Blueberries Improve Insulin Sensitivity in Obese, Insulin-Resistant Men and Women.” J. Nutr., Oct 2010; 140: 1764 - 1768.