Tirzepatide, a dual GLP-1 (Glucagon-Like Peptide-1)/GIP (Glucose-Dependent Insulinotropic Polypeptide) receptor agonist, has demonstrated unprecedented efficacy in obesity and diabetes, alongside pleiotropic actions on inflammation, fibrosis, and adipose remodeling. The gene discussed is GIPR; the disease is obesity due to melanocortin 4 receptor deficiency.