Regarding the effects of postnatal overnutrition in the regulation of gene expression in the ARH, we observed a statistically significant interaction between postnatal overnutrition and age effects on Grin2b (F(1, 30) = 6.943, p = 0.0132, Figure 4B), Grin1 (F(1, 30) = 4.410, p = 0.0442, Figure 4C), Gria-1 (F(1, 29) = 7.652, p = 0.0098, Figure 4D), Gabbr1 (F(1, 30) = 15.99, p = 0.0004, Figure 4E), Gabbr2 (F(1, 29) = 6.583, p = 0.0157, Figure 4F), Abcc8 (F(1, 29) = 7.375, p = 0.0110, Figure 4I) and Kcnj11(F(1, 31) = 6.649, p = 0.0149, Figure 4L) mRNA levels in the ARH. This evidence concerns the gene GRIN1 and overnutrition.