Women with recurrent GDM had higher pregravid BMI before the second pregnancy, tended to gain more weight during the interpregnancy period, and more often required insulin therapy during the first pregnancy due to more severe glycemic decompensation (42.3% vs. 10.0%, p = 0.012), as indicated by higher 75 g OGTT glucose levels, especially 1-h and 2-h post-load (median AUC glucose: 302.0 vs. 287.8 mg·h/dL, p = 0.028). Here, INS is linked to gestational diabetes.