Hormonal

GLP-1 receptor agonists (GLP-1RAs) such as semaglutide and tirzepatide reduce body weight primarily by suppressing energy intake through activation of GLP-1 receptors in the central nervous system (CNS) and peripheral vagal afferent pathways, rather than by increasing energy expenditure.

GLP-1 medications like semaglutide and tirzepatide are highly effective for weight loss, primarily by reducing appetite and food intake through brain and gut signaling. They are taken once weekly. While they achieve significant weight loss (15-20%+ in trials), real-world results vary, and about a third of users may not lose enough weight to be clinically effective. Common side effects like nausea are frequent but often manageable with dose titration. These drugs are not a magic bullet for everyone, especially those with type 2 diabetes or lower starting weights, and require medical supervision.