Gut Peptide-Satiety Signaling Is Disrupted in Spinal Cord Injury, Contributing to Overeating | Research

The takeaway

Spinal cord injury disrupts gut peptide-appetite coupling, with weakened ghrelin-hunger and GLP-1-fullness associations, potentially shifting appetite regulation toward glycemic cues and contributing to neurogenic obesity.

Broken gut-brain link
Normal connections between satiety peptides (ghrelin, GLP-1) and hunger/fullness signals were significantly weakened in SCI

What the researchers found

SCI patients showed GI dysmotility, exaggerated glycemic excursions, weakened ghrelin-hunger and GLP-1-fullness coupling (p<0.05), a shift toward glucose-driven satiety signals, and enhanced insulin-GLP-1 association.

Why it matters

Obesity after SCI significantly worsens health outcomes. Understanding that gut peptide signaling is disrupted opens new therapeutic targets—potentially including GLP-1 drugs.

How the study worked

Pilot study with 16 men with SCI and 16 controls consuming standardized meals (195g and 390g), measuring SmartPill GI motility, postprandial GI peptides, glucose, insulin, triglycerides, and hunger/satiety ratings.

What this study cannot tell us

Small pilot study (n=32). Men only. Cross-sectional design. Cannot determine causation between disrupted signaling and obesity.

How to read the evidence

Pilot study with novel methodology (SmartPill + peptide profiling + appetite ratings). Small sample but first to demonstrate gut peptide-satiety uncoupling in SCI.

When this study was published

Published in 2025.

The bigger picture

This connects gut peptide physiology to neurogenic obesity, suggesting that SCI disrupts the entire gut-brain peptide signaling axis, not just mobility.

Questions still open

Would GLP-1 drugs help restore satiety signaling in SCI patients?
Does the gut-brain peptide disruption worsen over time after SCI?
Could prokinetic agents improve gut peptide-satiety coupling in SCI?

Common questions

Why do people with spinal cord injuries gain weight?

Beyond reduced mobility, this study shows their gut-brain communication is broken. The normal signals from gut peptides that tell the brain 'you're full' are weakened after SCI, which may lead to overeating.

Could GLP-1 drugs help?

Possibly. Since GLP-1-fullness signaling is specifically weakened in SCI, strengthening this signal with GLP-1 drugs could help restore appetite regulation. This needs to be tested in clinical trials.

Read the original research

Gastrointestinal dysmotility and impaired gut peptide-satiety coupling in men with spinal cord injury.

Physiology & behavior, 305, 115207

View on PubMed ↗Publisher’s paper ↗

Citation

Farkas, Gary J; Cunningham, Paige M; Berg, Arthur S; Jimsheleishvili, George; Mendez, Armando J; Gater, David R; Nash, Mark S; Rolls, Barbara J. (2026). Gastrointestinal dysmotility and impaired gut peptide-satiety coupling in men with spinal cord injury.. Physiology & behavior, 305, 115207. https://doi.org/10.1016/j.physbeh.2025.115207