High blood sugar usually refers to fasting blood sugar higher than 6.1 mmol/L or 2 hours after meal blood sugar higher than 7.8 mmol/L. Patients can control blood sugar through dietary therapy, and should pay attention to avoid high sugar, high salt and high fat diet. Moderate intake of protein, such as fish, shrimp, chicken, beef, soy products and dairy products, is recommended. It is recommended to choose natural and non-additive foods and avoid refined and deeply processed foods. Patients can usually eat more vegetables, such as celery, spinach, leek, cabbage, cabbage and other green leafy vegetables, as well as cucumber, eggplant, winter melon, tomatoes, etc. Patients with high blood sugar are not completely unable to consume fruits. Patients with ideal blood sugar control can choose fruits with low glycemic index, mainly apples, pears, strawberries, etc., but they should control the amount they eat each time. Staple food is the main source of carbohydrates in human body and can directly affect blood sugar. Daily life should be appropriate to reduce the intake of staple foods, it is recommended that coarse and fine grains with an appropriate amount of coarse grains, such as oats, brown rice, buckwheat, etc..