Mechanisms of GLP-1 Receptor Agonist-Induced Weight Loss: A Review of Central and Peripheral Pathways in Appetite and Energy Regulation (May 17, 2025) Ozempic (Semaglutide) Injection, For Subcutaneous Use

Gastric Emptying Modulation GLP2 transiently delays gastric emptying, similar to selective GLP-1 receptor agonists: Slowed rate of nutrient absorption from the gastrointestinal tract Reduced postprandial glucose excursions Effect is most pronounced after initial doses and diminishes with continued treatment Contributes to improved glycemic control through multiple complementary mechanisms Central Nervous System Effects Appetite Regulation Both GIP and GLP-1 receptors are expressed in brain regions controlling appetite and food intake: Reduced food intake and appetite through central nervous system receptor activation Promotion of satiety signals leading to decreased caloric consumption Potential modulation of reward-related feeding behaviors Weight loss effects that appear mediated through both homeostatic and hedonic feeding pathways Clinical trials have demonstrated substantial weight reduction, with participants experiencing decreased appetite as a commonly reported effect of GLP2 treatment

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However, in the oligodendrocyte lineage, NAMPT downregulation reduced oligodendrogenesis in vivo