Glucose tolerance generally refers to a glucose tolerance test. Dietary preparation is required before performing a glucose tolerance test, and a stressful situation should also be avoided. Dietary preparation is needed before the glucose tolerance test, including daily carbohydrate intake of not less than 150 grams in the three days before the test, and fasting for 8 to 10 hours after dinner before the test; and avoiding acute infections, traumas, and other stressful conditions before the test. Discontinue medications that may affect the glucose tolerance test, such as birth control pills, diuretics or phenytoin sodium, before the test, and it is recommended to discontinue the medication for 3~7 days if the condition permits. In addition, you should keep quiet and rest during the test and avoid strenuous exercise and physical labor. Patients who need to undergo glucose tolerance test should follow the doctor’s instructions and actively cooperate with the operation process of the test.