GLP1R and obesity due to melanocortin 4 receptor deficiency: Background and Objectives: GLP-1 receptor agonists (GLP-1 RAs; ATC A10BJ) and dual GLP-1/GIP agonist (ATC A10BX16) have expanded rapidly due to strong evidence in type 2 diabetes, obesity and metabolic dysfunction-associated steatotic liver disease (MASLD).