In nine RCTs comprising 884 GDM women (mean age = 31.5 years, age range = 28.7–33.2 years, weeks of gestation range = 24.1–30.3), only a low GI diet reduced insulin use (RR = 0.767, 95% CI 0.597 to 0.986, p = 0.039) and the newborn birth weight (weight mean differences −161.9 g, 95% CI −246.4 to −77.4, p = 0.000) compared with control diets [37]. Here, INS is linked to gestational diabetes.