Hormonal
Direct activation of GLP-1 receptors in the ventral tegmental area (VTA) and nucleus accumbens (NAc) core reduces the intake of highly-palatable foods (sucrose and high-fat diet) and body weight, mediated by direct projections from NTS GLP-1 neurons.
This research suggests that GLP-1 medications (like semaglutide or liraglutide) work partly by targeting the brain's reward system (VTA and Nucleus Accumbens) rather than just signaling fullness to the stomach. By dampening the reward signal associated with highly palatable, high-fat, or sugary foods, these drugs reduce the motivation to eat them. This explains why users often find themselves losing interest in junk food specifically, rather than just feeling physically stuffed.
Pharmacological data showed that GLP-1R activation in the VTA, NAc core, and NAc shell decreased food intake, especially of highly-palatable foods, and body weight.
Why this rating
High-quality animal study with rigorous anatomical tracing (Fluorogold) and pharmacological validation (agonist/antagonist), though results are specific to rats.
Source
GLP-1 Neurons in the Nucleus of the Solitary Tract Project Directly to the Ventral Tegmental Area and Nucleus Accumbens to Control for Food Intake
Amber L. Alhadeff et al. · Endocrinology · 2011
DOI 10.1210/en.2011-1443
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