There is no such thing as “early diabetes”, and there is no such thing as early or late diabetes. Typical symptoms of diabetes are “three more and one less”, i.e., more drinking, more urination, more eating, accompanied by weight loss. There is individual variability in diabetes symptoms. Diabetic patients need to control the total calories and rationally allocate nutrients in their diet. In addition to the typical clinical symptoms of diabetes mellitus, some patients may have itchy skin and blurred vision. Diabetic patients need to pay attention to low-sugar, low-fat, low-salt diet, control the intake of staple foods (such as rice, noodles, etc.), it is recommended that buckwheat, corn, potatoes, etc. instead of refined rice and noodles as a staple food, to reduce the impact on blood glucose. More fresh vegetables and fruits can be eaten, and the proportion of three meals allocated is distributed according to 1/3 each or according to 1/5, 2/5, 2/5. It is recommended that diabetic patients visit hospitals in time and clarify the disease typing under the guidance of doctors, so as not to delay the condition and cause adverse consequences.