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SERIES: How GLP-1 WorksArticle 1 of 5
GLP-1 is the gut hormone that tells the brain you are full

What is GLP-1? GLP-1 is a peptide signal the gut releases after a meal. It helps coordinate insulin release, slows gastric emptying, and changes how the brain processes hunger, fullness, and food reward.

What is GLP-1 and where is it released?

GLP-1 stands for glucagon-like peptide-1. The gut releases it after nutrients reach the digestive tract.

What is GLP-1 doing after a meal?

GLP-1 helps coordinate insulin release when glucose rises, slows how quickly food leaves the stomach, and contributes to satiety and reward processing.

GLP-1 sits at the intersection of digestion, glucose handling, appetite, and signaling between the gut and the brain.

That combination makes GLP-1 a high-leverage signal. It coordinates metabolic and behavioral responses at the same time.

Why do GLP-1 drugs last longer than native GLP-1?

Native GLP-1 is brief and degrades within minutes. Engineered GLP-1 drugs extend that same pathway for longer duration so the signal stays active beyond a single meal window.

OneMoreThing

Svetlana Mojsov spent 38 years waiting for credit.

In 1986, Svetlana Mojsov synthesized GLP-1(7-37) and proved it was the active form.She found it in the intestine.She showed that this exact sequence controlled blood sugar regulation.

The initial patents listed her supervisor as the sole inventor.Mojsov fought for co-inventor status and won.But for decades, the major scientific prizes passed her over.The Lasker Award recognized her in 2024.

The science was never disputed.The credit was.

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References3 sources

How to read these sources

This article uses primary sources and reviews to separate mechanism, human evidence, and context.

ReviewExpert synthesis
Human TrialStudies in people
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Official LabelRegulator documents
MechanismCell and pathway logic
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  1. Review

    Physiological Reviews

    American Physiological Society

    Holst, J.J. · 2007 The physiology of glucagon-like peptide 1. Read source

    Used Here For

    Grounding the explanation of what GLP-1 is and how it acts in the body.

    Good For

    A comprehensive physiological account of GLP-1 across digestion, insulin, and appetite.

    Not For

    Comparing GLP-1 drugs or making treatment decisions.

    Physiological Reviews, 87(4)
    PMID 17928588
  2. Human Trial

    Diabetes

    American Diabetes Association

    Orskov, C., et al. · 1994 Tissue and plasma concentrations of amidated and glycine-extended glucagon-like peptide I in humans. Read source

    Used Here For

    Supporting how much active GLP-1 actually reaches circulation after release in humans.

    Good For

    Human data on GLP-1 forms and concentrations in blood and tissue.

    Not For

    Drawing conclusions about drug dosing or long-term treatment effects.

    Diabetes, 43(4)
    PMID 8138058
  3. Review

    Journal of Clinical Investigation

    American Society for Clinical Investigation

    Beutler, L.R. · 2026 GLP-1 physiology and pharmacology along the gut-brain axis. Read source

    Used Here For

    Explaining how GLP-1 signals along the gut-brain axis.

    Good For

    A current synthesis of GLP-1 physiology and pharmacology research.

    Not For

    Patient-specific treatment or dosing guidance.

    Journal of Clinical Investigation, 156(3)
    PMID 41542773