A postprandial blood sugar of 19 mmol/L or more is a very serious condition. The most serious problem of diabetes is that it can cause chronic complications of diabetes. If the postprandial blood sugar is not well controlled for a long time, all in the range of 19mmol/L or above, it can easily lead to diabetic ketoacidosis, and also cause serious chronic complications. For example, diabetic nephropathy, diabetic fundopathy, diabetic neuropathy, and even diabetic macrovascular disease, such as coronary heart disease, cerebrovascular accident, macrovascular disease, diabetic foot, etc. The above complications can seriously affect the quality of life, and even cause disability, bringing particularly serious consequences to patients. Therefore, if you don’t pay attention to the control of blood sugar, it will often lead to serious consequences. Therefore, we must pay attention to the control of diet in our daily life, including the control of diet quantity and adjustment of diet structure. In addition, it is necessary to carry out an appropriate amount of scientific exercise to assist in controlling blood sugar, which can effectively avoid the development of complications.