 To ensure that similar guidelines for GDM clinical treatment are maintained for the two groups, IMIP obstetrical staff will undertake the ongoing GDM management of all trial participants for the period of the study. Participants are usually clinically evaluated at minimum every two weeks depending on GDM control, according to the IMIP guidelines for GDM. A capillary glucose test is performed in each clinical visit. It will be analyzed the mean capillary glucose profile after intervention minimum of five determinations per woman. Insulin or oral hypoglycemic required will be compared among the two groups. 