Hyperglycemia is broadly divided into two types of conditions: those that have reached the diabetes standard and those that have mildly elevated blood sugar. In the case of mildly elevated blood sugar, but not yet at the level of diabetes, attention should also be paid, otherwise the blood sugar will soon exceed the standard and reach the level of diabetes. Because many of the elevated blood glucose at this time is due to eating too much calorie-rich food or sugary food, better results can be achieved through active dietary management. A strict diabetic diet is not required at this time, but it is important to ensure that staple foods are rationed and as healthy as possible, and that calories are not exceeded. Also do not drink alcohol if possible. And after the diagnosis of diabetes it is necessary to determine the specific diet plan according to different situations. The first step is to determine the specific types of food according to the condition and work situation, and to avoid high-calorie foods such as fried foods and sweets. Avoid foods with a high glycemic index, such as various kinds of thin rice or rice paste. Also note that certain vegetables, although they are vegetables, are actually carbohydrates, such as groundnuts, potatoes, yam’s, etc. These foods should also be avoided, and if you eat too much, you should reduce the amount of the corresponding staple food, otherwise it will also cause blood sugar fluctuations. There are many calorie content tables and glycemic indexes of various specific foods on the internet, which can be downloaded for comparison. In conclusion, high blood sugar is not a contraindication to certain foods, but rather a specific diet plan to be determined according to different situations.