The Effect of Early Nutrition Intervention on the Incidence of High-risk Patients With Gestational Diabetes

Inclusion Criteria: * early pregnant women (\< 12 weeks) * fasting blood glucose \< / = 5.6 mmol/L and glycosylated hemoglobin \< / = 5.6% * prepregnancy overweight (BMI \> 23.9) or body fat content more than 30% (based on body composition analysis) * no history of major diseases or long-term drug treatment * no obvious physical disabilities, the ability of physical activity is normal * dietary behavior and mental is normal * resident in Beijing, early and middle stage pregnancy can be in Beijing area to receive regular obstetric examinations * signed informed consent * the following at least one * first-degree relatives family history of diabetes * history of abnormal lipid metabolism or abnormal lipid metabolism * history of polycystic ovary syndrome * history of large for gestational age infant or macrosomia deliver Exclusion Criteria: * history of gestational diabetes mellitus * clinical glucose metabolism abnormalities * once taking diabetes drugs or insulin injections * a variety of food allergies or food choices serious limitations * exercise during pregnancy contraindication