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How GLP-1 WorksArticle 1 of 6

What is GLP-1?

GLP-1 is a peptide signal released in the gut after eating. It helps stimulate insulin release, slows gastric emptying, and contributes to how the brain processes hunger, fullness, and food reward.

GLP-1 stands for glucagon-like peptide-1.

The gut releases it after nutrients reach the digestive tract. From there, the signal becomes part of a broader regulatory response. It helps coordinate insulin release when glucose rises after a meal. It slows the movement of food out of the stomach. It also contributes to how satiety and food reward are processed.

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

That combination is what makes GLP-1 such an important signal. It coordinates four systems at once.

The natural signal is brief. Enzymes break it down within minutes. Engineered GLP-1 drugs matter because they keep that pathway active much longer. The broader pathway is mapped in The GLP-1 Highway.

One More Thing

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 exactly 30 amino acids, in one specific 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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References03 sources
  1. Holst, J.J. · 2007
    The physiology of glucagon-like peptide 1.
    Physiological Reviews, 87(4)
  2. Orskov, C., et al. · 1994
    Tissue and plasma concentrations of amidated and glycine-extended glucagon-like peptide I in humans.
    Diabetes, 43(4)
  3. Beutler, L.R. · 2026
    GLP-1 physiology and pharmacology along the gut-brain axis.
    Journal of Clinical Investigation, 156(3)
What is GLP-1? · Catalyst / Science Explained · Catalyst