Patients with GLUT1-DS were diagnosed at an older age (median 8.5 (IQR 5.0–10.0) years) than those with DRE (median 4.0 (IQR 1.0–7.5) years; p = 0.041) and began dietary treatment earlier after diagnosis (median interval 0.0 (IQR 0.0–1.0) years, vs. median 4.7 (IQR 3.5–6.5) years, respectively, p < 0.001)—an expected finding, since cKD is the only available treatment for GLUT1-DS. This evidence concerns the gene SLC2A1 and Dravet syndrome.