The Enterolimbic Axis: How Gut Peptides Like GLP-1 Control Appetite, Mood, and Reward | Research

The takeaway

The enterolimbic axis framework integrates gut peptide signaling (GLP-1, GIP) with reward processing and emotional regulation, positioning gastroenterologists as key prescribers of incretin therapies for metabolic and eating disorders.

Gut → mood → metabolism
The enterolimbic axis shows gut peptides simultaneously regulate metabolism, emotional states, and reward processing

What the researchers found

The enterolimbic axis integrates gut-derived GLP-1, GIP, and SCFAs with hypothalamic and mesolimbic reward pathways, supporting the repositioning of incretin therapies for metabolic, eating, and affective disorders.

Why it matters

Understanding that gut peptides control both metabolism and mood/reward redefines how we think about obesity, eating disorders, and mental health — and who should prescribe treatments.

How the study worked

Conceptual review integrating molecular, clinical, and therapeutic evidence on the enterolimbic axis and its implications for precision medicine.

What this study cannot tell us

Conceptual framework. Direct evidence for some proposed pathways is limited. Clinical applications are emerging but not fully validated.

How to read the evidence

Conceptual review with supporting molecular and clinical evidence. Novel framework needing prospective validation.

When this study was published

Published in 2025.

The bigger picture

The enterolimbic axis bridges gastroenterology, endocrinology, and psychiatry, revealing that gut peptides are central regulators of both physical and mental health.

Questions still open

Should GLP-1 drugs be prescribed by gastroenterologists for eating disorders?
How do gut microbiota changes affect enterolimbic signaling?
Can the enterolimbic framework improve precision medicine for obesity?

Common questions

What is the enterolimbic axis?

It's a framework describing how gut hormones like GLP-1 connect to brain emotion and reward centers. This explains why GLP-1 drugs affect not just weight and blood sugar, but also mood, food cravings, and potentially addiction.

Could my gut health affect my mental health?

Yes. The enterolimbic axis shows that gut bacteria produce molecules that influence brain reward and emotional circuits through peptide hormones like GLP-1 and GIP, connecting digestive health directly to mental well-being.

Read the original research

The Enterolimbic Axis: Gut-Brain Affective Circuits at the Crossroad of Metabolism, Emotion, and Behavior.

The American journal of gastroenterology

View on PubMed ↗Publisher’s paper ↗

Citation

Gasbarrini, Antonio; Galli, Francesca Sofia; Ianiro, Gianluca; Ponziani, Francesca; Rinninella, Emanuele. (2026). The Enterolimbic Axis: Gut-Brain Affective Circuits at the Crossroad of Metabolism, Emotion, and Behavior.. The American journal of gastroenterology. https://doi.org/10.14309/ajg.0000000000003907