The staple diet of patients with hyperglycemia promotes the consumption of coarse rice, pasta and certain mixed grains. Hyperglycemia refers to the concentration of glucose in the blood exceeding the normal value. Staple foods with low glycemic index have a long residence time after entering the intestines, and the peak value of glucose after entering the blood is lower, which has less impact on postprandial blood glucose, can avoid large fluctuations in blood glucose, and help patients with high blood glucose control their blood glucose. The glycemic index of crude rice, noodles and grains is low, for example, rye has a glycemic index of about 34; corn has a glycemic index of about 55; and wheat has a glycemic index of about 41. Moreover, the above foods contain more dietary fiber, which makes it easy to feel satiated after eating them, and also promotes the effect of intestinal peristalsis. Patients diagnosed with hyperglycemia should actively cooperate with doctors to maintain a healthy diet.