Hyperglycemia is broadly divided into two situations: mildly elevated blood sugar, in the pre-diabetes and has reached the diabetes standard. If the blood sugar is mildly elevated, but not yet reached diabetes, but at this time also need to pay special attention, otherwise the blood sugar will soon exceed the standard to reach the level of diabetes. Because much of the elevated blood glucose at this time is due to eating too many foods with too many calories or sugary foods, better results can be achieved through active dietary management. At this time does not require a strict diabetic diet, but as far as possible to ensure that the staple food regularly quantitative in the normal diet under the state choose to eat more of some of the lower sugar content of the food, fruit selection of some of the sugar content is not very high fruit. If the blood glucose has reached the standard of diabetes mellitus, you need strict dietary control, to have reasonable eating habits and diet structure, meals should be regular and quantitative, can not eat at random, food selection should be diversified, cereals are the basis, protein should choose some high-quality protein consumption, such as egg whites, poultry, fish and so on. Should also eat more high-fiber foods, such as corn, brown rice, oats, buckwheat and so on. As for fruits, it is recommended to consume some fruits with small sugar content in the middle of two meals under stable blood sugar control, such as tomatoes, cucumbers, watermelons, grapefruit, oranges and so on. So the high blood sugar situation should be based on individualized principle situation to determine the specific diet plan. It is not to try not to eat, but to eat reasonably and adjust the structure of the diet according to the blood sugar situation. There are also many calorie content tables and glycemic indexes for specific foods on the Internet, which can be downloaded for comparison.