Effect of BRE supplementation on blood concentration of glucose and insulin. Concentrations of fasting blood glucose (A), and serum insulin (B), and insulin resistance index (C) for each group during 7-wk feeding experiments. HOMA-IR = fasting glucose (mg/dl) × fasting insulin (mU/L)/405. Data are expressed as mean ± standard error (n = 8 per group). Means with different letters (a, b, or c) on the bar are significantly different from each other at p < 0.05 by Duncan's multiple range test.