欺骗大脑 “我吃饱了” ，司美格鲁肽是如何做到的?

Core Insights - The article discusses the effectiveness of GLP-1 receptor agonists, particularly semaglutide and tirzepatide, in weight loss and glucose control, emphasizing their ability to enhance feelings of satiety before and during meals [5][14]. Mechanisms of Action - GLP-1 receptor agonists activate specific neurons in the hypothalamus, leading to pre-ingestive satiation, which allows individuals to feel full before consuming large amounts of food [7]. - Semaglutide directly suppresses appetite by activating GLP-1 receptors in the brain, reducing hunger motivation and enhancing satiety signals [8]. - These drugs slow gastric emptying, prolonging the duration of satiety by maintaining a steady flow of mechanical and chemical signals from the gastrointestinal tract [9]. - They stabilize blood sugar levels by promoting insulin secretion and inhibiting glucagon release, which helps reduce cravings for high-calorie foods [9]. Clinical Outcomes - In clinical trials, semaglutide has shown an average weight loss of approximately 14.9% over 68 weeks in non-diabetic populations, compared to a 2.4% loss in the placebo group [9]. - Tirzepatide, a dual GLP-1 and GIP receptor agonist, has demonstrated an average weight loss of about 20% over 72 weeks, outperforming single-target GLP-1 medications [10]. Key Pathways - The central nervous system pathway activates hypothalamic neurons to enhance and amplify feelings of fullness while inhibiting hunger signals [11]. - The gastrointestinal-vagal pathway slows gastric emptying, reinforcing the sensation of fullness [11]. - The insulin-metabolic pathway smooths blood sugar fluctuations, reducing the drive to eat due to unstable glucose levels [11]. User Considerations - Common side effects include nausea, vomiting, and abdominal discomfort, primarily related to delayed gastric emptying, which typically improve over time [13]. - Both medications require weekly subcutaneous injections, with a gradual dose escalation recommended to improve tolerance [13]. - Individual results may vary, and combining medication with dietary, exercise, and behavioral management is essential for achieving long-term weight and metabolic benefits [13].