Diabetes mellitus is a group of metabolic diseases characterized by hyperglycemia. Hyperglycemia, in turn, is caused by defective insulin secretion or impairment of its biological action, or both. The long-term presence of hyperglycemia in diabetes leads to chronic damage and dysfunction of various tissues, especially the eyes, kidneys, heart, blood vessels and nerves. What should not eat when diabetic hyperglycemia? 1, sweet potato. Because of the sweet taste, rich in nutrients, sweet potatoes have been loved by people, at the same time, the latest research also shows that sweet potatoes have a certain anti-cancer effect, but can not be ignored is that the sugar content of sweet potatoes is 27.7%, its glycemic index is also high, therefore, high blood sugar patients are best not to eat sweet potatoes. Really want to eat must correspondingly reduce the amount of staple foods, and to choose white skin sweet potatoes. 2, honey. Honey is mainly composed of glucose, fructose, such as monosaccharides, can be directly absorbed by the body, and therefore blood sugar rises rapidly, but this is fatal for diabetics, therefore, diabetics should be prohibited from eating honey. But hyperglycemic patients can eat the right amount of royal jelly, not only more nutritious, royal jelly also contains insulin-like, beneficial to hyperglycemic patients. 3, persimmon. Persimmon is rich in sucrose, glucose, fructose, i.e. high sugar content, and are also monosaccharides and disaccharides, most unsuitable for hyperglycemic patients. Although, the taste of persimmon is mouth-watering, but high blood sugar patients for their own health, please control their own mouth, family members should also carry out appropriate supervision. 4.Ice cream. In the hot summer, the biggest temptation for hyperglycemia patients is ice cream. Ice cream is not very high calorie, its terrible is very high sugar content, hyperglycemic patients should avoid it. 5, preserves. Sweet and sour candied fruit, both young and old: but for hyperglycemic patients, this should definitely be classified as a no-go area, candied fruit is made of sugar, and therefore contains very high sugar content, at the same time, also contains other substances harmful to the body, therefore, hyperglycemic people, especially some female patients who love to eat snacks, please be sure to stay away from candied fruit, and candied fruit similar to jam. 6, beer. I often hear that alcohol is not good for blood sugar control, so some hyperglycemic patients, holding a fluke, think that drinking beer with low alcohol concentration, should not be too big a problem, but the fact is not. The maltose content in beer is high, and as a monosaccharide, it is much more dangerous for people with high blood sugar. In short, whether or not diabetes diet should adhere to the principle of less oil, less salt and less sugar, while achieving a balanced nutrition and reducing high-calorie diet, blood sugar will not fluctuate too much because of diet, and medication and other treatment modalities can have maximum effect.