Glucose tolerance tests were carried out after four weeks of feeding of both NPD and HFD. After an overnight fast, blood samples were collected from the retro orbital plexus. Glucose levels were measured at time zero (0 min) and glucose was injected into the rats (2 g/Kg/4 ml, i.p.,). Additional blood samples were taken at 15, 30, 60 and 120 min. following the glucose load. Plasma glucose levels were measured by the glucose oxidase reaction (GOD/POD) using commercial kit (Qualigens, Mumbai, India). Area under the curve (AUC) was calculated for both NPD and HFD fed rats.