Diet therapy is the foundation of diabetes treatment and an important element of diabetes treatment. The key to the control of diabetes lies in the correct understanding and implementation of diet therapy measures. Diet therapy is not just about not eating sugar, and it is not about starvation therapy. The ultimate requirement is the total amount of reasonable nutrition and the distribution of various reasonable nutrients. 1, simple oral drug therapy can not be done according to the patient’s diet at any time to change the dose of drugs or adjust the type of drugs, it is necessary to choose insulin to achieve rapid and effective sugar reduction. This inevitably leads to the adverse effects of long-term insulin injections – weight gain, which induces a vicious circle, a gradual increase in insulin dose and insulin resistance. 2. Our “Daqing Study” has clearly confirmed that lifestyle interventions can significantly reduce the incidence of diabetes and the risk of microcirculatory complications of diabetes. Thus, from the perspective of preventing diabetes and treating chronic complications of diabetes, diet therapy is always observed in the treatment of diabetes. 3. In foreign countries, patients respect doctors more and follow their advice, so they can easily accept insulin injections. In our country, even when patients have obvious chronic complications of diabetes and must be injected with insulin, our doctors have to make great efforts to persuade patients to accept insulin, not to mention the use of insulin treatment just for a few more bites of food! This is a disadvantage that our diabetic patients recognize, but at the same time it is also an advantage that our doctors can use, because the fear of using insulin makes our diabetic patients more receptive to strict dietary control.