MMP9 and gestational diabetes: Indeed, in this study, we found increased activity of MMP9 in maternal plasma in the GDM group, an alteration prevented by the maternal diet enriched in EVOO, whereas in our primary study performed in this cohort of GDM patients, we found that the EVOO-enriched diet prevents MMP gelatinolytic overactivity in the placenta and cord blood of GDM patients (22).