A Behavioral Intervention to Prevent Gestational Diabetes Mellitus

Gestational diabetes mellitus (GDM) increases the risk of adverse pregnancy outcome and developing type 2 diabetes after delivery. It is well recognized that behavioral intervention is effective in preventing type 2 diabetes in high risk population. Recently, some studies showed that exercise, dietary and weight control reduced the risk of developing GDM in obese/over weight women or in women with GDM history. With the increasing use of smartphones, mobile applications (APPs) can be applied in the education and management of chronic diseases, including diabetes. Therefore, the investigators will conduct a multi-centered, two-armed, open-labeled, randomized controlled trial to evaluate whether early lifestyle intervention with a mobile APP can prevent the occurrence of GDM in pregnant women who are at high risk of this disease. The investigators hypothesis that behavioral intervention from the first trimester of pregnancy with mobile APP that incorporates nutrition, exercise and phycological support will: 1. Reduce the risk of developing GDM in pregnant women with risks of GDM. 2. Improve the pregnant women's adherence of behavioral intervention and their satisfaction of prenatal medical care.