Gestational Diabetes: The Best Food And Nutrition Approach To Healthy Living. Gestational diabetes mellitus, or GDM, is a type of diabetes that affects pregnant individuals. As indicated by the European Association for the Study of Diabetes, GDM is characterized as any level of glucose bigotry that isn't plainly prior to diabetes. Having GDM can build the gamble of high blood glucose levels in your newly-conceived, macrosomia...