Diabetic patients eat coarse grains such as corn, oat bran, buckwheat, black rice porridge, but pay attention to moderation. Diabetic patients should maintain a healthy diet, avoid eating foods with high sugar and fat content, recommended to eat some low glycemic index of coarse grains, such as corn, glycemic index of 55; buckwheat (yellow), glycemic index of 54; black rice porridge, glycemic index of 42.3; oat bran, glycemic index of 55; wheat (whole grain, boiled), glycemic index of 41. Coarse grains are rich in dietary fiber, which can promote defecation and enhance satiety, and the glycemic index of the above coarse grains is not too high, so patients with diabetes should eat these foods appropriately, which usually does not cause large fluctuations in blood glucose. Patients diagnosed with diabetes should actively cooperate with their doctors to maintain a healthy diet and lifestyle.