The types of diabetes are type 1 diabetes, type 2 diabetes, gestational diabetes and special types of diabetes. The diagnostic criteria and control criteria of gestational diabetes are different from those of ordinary patients. 1. Diagnostic criteria 1. lower blood glucose value than the diagnostic criteria for diabetes; 2. lower blood glucose value for fasting diagnosis than the criteria for pre-diabetes; 3. increased blood glucose value 1 hour after taking sugar than pre-diabetes and diabetes. Gestational Diabetes Mellitus has more stringent control goals than ordinary patients (GDM: Gestational Diabetes Mellitus; PGDM: Pregnancy with Diabetes Mellitus). Because the development of the fetus is also ensured during pregnancy, the dietary requirements also have their own characteristics. The principle is to ensure the energy needs of the pregnant woman and the fetus, and to maintain blood glucose in the normal range without the occurrence of starvation ketosis. The ratio and requirements of the three major nutrients Carbohydrates: 50-60% of daily intake, choose low glycemic index Protein: 15-20% of daily intake, choose high quality protein Fat: 25-30% of daily intake, reduce the intake of trans fatty acids.