GLP-1 (glucagon-like peptide-1) is a hormone that is produced in the gut and regulates glucose metabolism by increasing insulin secretion and decreasing glucagon secretion, leading to lower blood sugar levels. It is also known to slow gastric emptying and promote satiety, making it a potential treatment for obesity and type 2 diabetes. GLP-1 receptor agonists, such as exenatide and liraglutide, are drugs that mimic the actions of GLP-1 and are used to treat type 2 diabetes.