The results of intraperitoneal glucose tolerance test are shown in Figure 2.The Area under the curve glucose concentrations of diabetic rats fed with high fat diet containing RBBO supplement or metformin declined and were significantly diminished after 120 min whereas the AUCglucose of the untreated diabetes (DMC group) continued to increase. In addition, no significant difference was observed in AUCglucose between the NC and NR groups.