Alcohol Damages the Brain's Own GLP-1 System, Suggesting Incretin Drugs Could Help | Research

The takeaway

Alcohol use disorder is associated with reduced GLP-1, GIP, leptin, and ghrelin expression in the frontal lobe, suggesting that GLP-1 receptor agonists could help restore brain energy metabolism and cognitive function.

Depleted brain GLP-1
The frontal lobe showed reduced GLP-1, GIP, leptin, and ghrelin in people with alcohol use disorder

What the researchers found

AUD reduced GLP-1, GIP, leptin, and ghrelin immunoreactivity in the frontal lobe, while pancreatic polypeptide was reduced in the cerebellar vermis, alongside increased neurodegeneration marker NfL in both regions.

Why it matters

If alcohol damages the brain's incretin system, GLP-1 drugs could potentially treat not just the addiction aspects of AUD but also the cognitive and neurobehavioral deficits that make recovery so difficult.

How the study worked

Postmortem study comparing cerebellar vermis and anterior frontal lobe tissue from 6 adult male AUD donors and 6 controls using duplex and multiplex ELISAs for NfL and gut hormone panel.

What this study cannot tell us

Very small sample size (6 per group). Male subjects only. Postmortem tissue analysis cannot determine causality or temporal relationships. Cannot distinguish effects of alcohol from effects of nutritional deficiency common in AUD.

How to read the evidence

Small postmortem study (n=12 total) providing mechanistic insight. Novel finding but very limited sample size requires replication.

When this study was published

Published in 2025, providing the first human evidence of brain incretin depletion in alcohol-related brain damage.

The bigger picture

This connects the burgeoning field of GLP-1 therapy for addiction with a mechanistic explanation: alcohol literally depletes the brain's incretin signaling, and GLP-1 drugs could replenish it.

Questions still open

Would GLP-1 receptor agonists restore frontal lobe incretin signaling and improve cognition in living AUD patients?
Are the brain incretin changes reversible with sobriety alone, or do they require pharmacological intervention?
Do females with AUD show the same pattern of brain incretin depletion?

Common questions

Does alcohol damage the brain's metabolic signaling?

Yes. This study found that chronic alcohol abuse depletes important signaling molecules including GLP-1 and GIP in the brain's frontal lobe, which likely contributes to the cognitive problems seen in alcohol-related brain damage.

Could GLP-1 drugs help people recover from alcohol brain damage?

The findings suggest this is plausible—by restoring depleted incretin signaling in the brain. However, this has not yet been tested in clinical trials and remains a hypothesis that needs further research.

Read the original research

Impaired Brain Incretin and Gut Hormone Expression in Human Alcohol-Related Brain Damage: Opportunities for Therapeutic Targeting.

Biomolecules, 16(1)

View on PubMed ↗Publisher’s paper ↗

Citation

de la Monte, Suzanne M; Tong, Ming; Carlson, Rolf I; Sutherland, Greg. (2026). Impaired Brain Incretin and Gut Hormone Expression in Human Alcohol-Related Brain Damage: Opportunities for Therapeutic Targeting.. Biomolecules, 16(1). https://doi.org/10.3390/biom16010099