As we previously reported in an article [36], these results contradict the meta-analysis conducted by Du, J., et al. (2012), which showed a significant association of the rs1801282 polymorphism in the PPARG gene with a reduced risk of GDM only in Asian populations (four studies, 1197 GDM cases compared to 1026 controls; OR = 0.72, 95% CI: 0.56–0.93), but not in Europeans (six studies, 1732 GDM cases compared to 5943 controls; OR = 1.07, 95% CI: 0.91–1.18) [37]. This evidence concerns the gene PPARG and gestational diabetes.