The aim of this study was to assess the effects of acute Glucagon-like peptide-1 (GLP-1) receptor agonist administration on metabolic and endocrine responses to a standardized meal test in individuals who have undergone Roux-en-Y gastric bypass surgery (RYGB), and thus to uncover mechanisms that might be important in post-bariatric hypoglycemia. The gene discussed is GLP1R; the disease is Hypoglycemia.