We observed that the GDM group (BMI<25 kg/m2) had higher maternal age (p=0.040) and higher serum levels of fasting glucose (p<0.001), 1-h glucose (p<0.001), 2-h glucose (p<0.001), 2-h insulin (p<0.001), and TG (p=0.007) when compared to the NGT group (BMI<25 kg/m2). This evidence concerns the gene INS and gestational diabetes.