How semaglutide works, without the hype
→ GLP-1 is a hormone your gut releases after you eat.
→ Natural GLP-1 lasts about 2 minutes in the blood. Semaglutide is modified to last about a week.
→ Pancreas: more insulin when blood sugar is high, less glucagon.
→ Stomach: food leaves more slowly.
→ Brain: more fullness, less appetite.
→ STEP 1 trial: −14.9% average body weight at 68 weeks vs −2.4% with placebo (both with lifestyle support).
📌 Save this for the next time someone says "it just burns fat".
📤 Send it to a friend who asked how these medicines work.
Which surprised you most: brain, stomach or pancreas?
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Education only — not medical advice.
Sources
Sources 📚
• Drucker DJ. Mechanisms of Action and Therapeutic Application of Glucagon-like Peptide-1. Cell Metabolism, 2018;27(4):740–756.
• Holst JJ. The physiology of glucagon-like peptide 1. Physiological Reviews, 2007;87(4):1409–1439.
• Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). NEJM, 2021;384:989–1002.