AGRP is a neuropeptide antagonist of melanocortin receptors MC3R and MC4R in the hypothalamus, functioning as a central regulator of appetite and feeding behavior. By blocking melanocortin signaling and inhibiting cAMP production, AGRP promotes hunger and increases food intake as part of the central melanocortin system. The protein also enhances receptor internalization through an arrestin-dependent mechanism. AGRP neurons in the arcuate hypothalamus receive integrated signals from peripheral hormones including ghrelin, leptin, and insulin, and relay GABAergic outputs to downstream circuits that control both feeding behavior and affective states 1. Recent mechanistic studies reveal that synaptic plasticity at glutamatergic inputs onto AGRP neurons from the paraventricular hypothalamus contributes to long-term weight regulation and weight regain after caloric restriction 2. AGRP neurons are inhibited by multiple satiety-promoting pathways, including GLP-1 receptor agonists such as liraglutide through TRH-expressing Arc neurons 3, and by the exercise-derived metabolite Lac-Phe via KATP channel activation 4. Dysregulation of AGRP neuronal function contributes to obesity pathogenesis; iron accumulation in AGRP neurons promotes diet-induced obesity, while altered lipid metabolism and impaired GABAergic signaling further compromise energy homeostasis 5, 6. Understanding AGRP circuit mechanisms informs therapeutic strategies targeting appetite suppression and metabolic restoration in obesity.