At present, the dietary structure of Chinese residents is in transition. The dietary structure in transition is characterized by an increase in fat and calorie intake and a decrease in physical activity, especially in some large cities, which is closely related to the dramatic increase in the incidence of diabetes and is a serious threat to human health. According to modern research, certain effects of dietary fiber can prevent and treat diabetes. 1, hypoglycemic effect: dietary fiber can delay the time of food digestion, reducing the concentration of glucose in the intestine, reducing the absorption of sugar in the small intestine, thus preventing a sharp rise in blood sugar after meals; soluble dietary fiber into the gastrointestinal water absorption and expansion, gelatinous, thus hindering the absorption of glucose in the intestine, so that the glucose not absorbed with the stool out of the body. 2, weight reduction: dietary fiber can increase the volume of gastric contents, produce a sense of satiety, thereby reducing the amount of food intake, while limiting the absorption of some sugar and fat in the gastrointestinal tract, so that the body fat consumption increases, to achieve the purpose of weight loss. 3, laxative effect: promote intestinal peristalsis, shorten intestinal evacuation time, and soften the stool, play a laxative role. Dietary fiber, known as the “seventh macronutrient”, refers to those who are not easily digested and absorbed polysaccharide carbohydrates. It is divided into water-soluble fiber and non-water-soluble fiber. Cellulose, some hemicellulose and lignin are non-soluble fibers, which are found in plant cell walls; pectin, gum and mucilage are water-soluble fibers, which are found in non-fibrous materials in nature. The main sources of dietary fiber are brown rice, corn, millet, barley, wheat bran (or rice bran) and wheat flour (raw material of dark bread). In addition, there are more dietary fiber in root vegetables and seaweeds, such as burdock, carrots, string beans, red beans, peas, potatoes and wakame. In 2000, the Chinese Nutrition Society proposed that the daily dietary fiber for patients on a low-energy diet is 25g; for a medium-energy diet, 30g/day; and for a high-energy diet, 35g/day. For such “rich disease” as diabetes, on this basis should be increased by 10-15 grams per day. In daily life, the intake of dietary fiber should be based on your own situation, according to the recommended amount of intake, moderate, not too much. The correct relationship between dietary fiber and diabetes, adjust the structure of the diet, stabilize the grain (cereal-based), ensure vegetables, increase dairy, control oil, adjust the structure of meat (increase fish and poultry, reduce pork), and insist on it, you can “eat back” diabetes.