Glucose kinetics and area under curve of glucose during OGTT. Glucose kinetics and area under the curve of blood glucose levels during the glucose tolerance test. A 20% glucose solution (2 g/kg of body weight) was administered to the rats by gavage, after a 15 h fasting. Blood samples were collected before and at 30, 60 and 120 minutes after glucose administration. The results were analyzed by the calculated areas under the curves of serum glucose. C= Control; L= Light Soft Drink; R = Regular Soft Drink. n = 15 animals in each group.