Do GLP-1 Drugs Change How the Brain Responds to Food and Reward Cues? | Research

The takeaway

Limited fMRI evidence tentatively suggests GLP-1 receptor agonists may reduce brain reactivity to food cues in reward regions, but studies are small, inconsistent, and effects may diminish over time.

Only 11 studies
Despite massive clinical interest, very few neuroimaging studies have examined how GLP-1 drugs affect brain reward circuits

What the researchers found

Only 11 fMRI studies exist on GLP-1 RA effects on brain reward responses. Limited evidence suggests acute administration may reduce food cue reactivity in appetite and reward brain regions, but effects appear inconsistent and may attenuate with chronic treatment.

Why it matters

Understanding how GLP-1 drugs affect brain reward circuits is crucial for explaining their weight loss effects and potential for treating substance use disorders like alcohol addiction.

How the study worked

Systematic review of 1,209 records from comprehensive literature search, with 11 studies meeting eligibility criteria for analysis of fMRI-measured brain responses to reward cues during GLP-1 RA treatment.

What this study cannot tell us

Very few eligible studies (11). Small sample sizes throughout. Heterogeneous medications, doses, and protocols. Almost no data on non-food reward cues. No standardized control conditions.

How to read the evidence

Systematic review finding a very limited evidence base. The field is in its infancy, with most studies underpowered and methodologically heterogeneous.

When this study was published

Published in 2025, mapping the current gaps in understanding GLP-1 brain mechanisms.

The bigger picture

The potential for GLP-1 drugs to treat addiction by modulating reward circuits is generating enormous interest. This review reveals how little we actually know about these brain mechanisms and highlights the urgent need for larger, better-designed neuroimaging studies.

Questions still open

Do GLP-1 drugs reduce brain reward responses to alcohol and other addictive substances?
Why might the brain reward-dampening effects of GLP-1 drugs diminish with chronic use?
How do individual differences (obesity, addiction history) affect brain responses to GLP-1 drugs?

Common questions

Can Ozempic or Wegovy help with food addiction?

Limited brain imaging evidence suggests GLP-1 drugs may temporarily reduce how strongly the brain responds to food cues. However, the evidence is still very sparse and inconsistent, so it is too early to draw firm conclusions.

Could GLP-1 drugs treat other addictions like alcoholism?

Only one brain imaging study has examined GLP-1 drugs and alcohol cues. While there is theoretical interest, much more research is needed before GLP-1 drugs could be considered for addiction treatment.

Read the original research

Do GLP-1 Receptor Agonists Alter Brain Responses to Reward-Related Cues? A Systematic Review.

bioRxiv : the preprint server for biology

View on PubMed ↗Publisher’s paper ↗

Citation

Dang, Vincent; Sambuco, Nicola; Yammine, Luba; Versace, Francesco. (2026). Do GLP-1 Receptor Agonists Alter Brain Responses to Reward-Related Cues? A Systematic Review.. bioRxiv : the preprint server for biology. https://doi.org/10.64898/2026.01.31.702984