Correlation between glucose infusion rates and BMI. Correlation analyses between glucose infusion rates and BMI in low (open cycle; n = 15; Fig. 2A) and normal weight subjects (gray cycles; n = 15; Fig. 2B) as well as in obese men (black cycles; n = 15; Fig. 2C). Data show a positive correlation between BMI and glucose tolerance in low and normal weight participants which was found inverse in obese subjects.