PMID-24811133 – Effects of GLP-1 on Appetite and Weight
Shah M, Vella A. Effects of GLP-1 on Appetite and Weight. Rev Endocr Metab Disord. 2014;15(3):181-187.
Quick Reference
| Property | Value |
|---|---|
| PMID | 24811133 |
| DOI | 10.1007/s11154-014-9289-5 |
| Year | 2014 |
| Journal | Reviews in Endocrine and Metabolic Disorders |
| Study Type | Narrative Review |
| Evidence Level | V |
| Sample | N/A (review of appetite and weight regulation mechanisms) |
| Peptide(s) Studied | GLP-1 (Native) |
Key Findings
- GLP-1 reduces food intake through both peripheral and central mechanisms acting in a synergistic, coordinated manner
- Peripheral GLP-1 delays gastric emptying via vagal afferent signaling, contributing to early satiation and prolonged postprandial fullness
- Central GLP-1 receptors in the hypothalamic arcuate nucleus and paraventricular nucleus directly suppress appetite by modulating POMC/CART and NPY/AgRP neuronal activity
- Brainstem GLP-1-producing neurons in the nucleus tractus solitarius (NTS) integrate peripheral satiety signals with central appetite circuits
- GLP-1 infusion studies in humans demonstrate dose-dependent reductions in caloric intake (15-30% reduction) and subjective hunger ratings
- The short half-life of native GLP-1 (~2 minutes) limits its physiological role to meal-related satiety, but long-acting GLP-1RAs achieve sustained appetite suppression and clinically meaningful weight loss
Study Design
Narrative review integrating human infusion studies, rodent lesion/injection experiments, neuroimaging data (fMRI studies of GLP-1 effects on brain reward centers), and early clinical trial data with GLP-1 receptor agonists for weight management.
Limitations
- Published before the STEP trials (semaglutide 2.4 mg for obesity) and SURMOUNT trials (tirzepatide for obesity) that demonstrated 15-22% body weight reductions
- Does not address the contribution of nausea/aversion vs true appetite suppression to GLP-1RA-mediated weight loss
- Limited discussion of GLP-1's effects on food reward processing and hedonic eating, which have since been shown to be major contributors to weight loss efficacy
Clinical Relevance
Establishes the mechanistic basis for GLP-1-mediated weight loss, which is central to the rationale behind the Ageless Peps Weight Loss FAST Melts and the broader weight management protocol. Understanding the dual peripheral (gastric emptying) and central (hypothalamic appetite suppression) mechanisms helps clinicians set appropriate patient expectations and optimize dosing strategies. Directly relevant to Academy Module 5.
Related
#research #narrative-review #glp-1 #evidence-level-V