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How do GLP-1 drugs work?

Reviewed by the glpzoom Editorial Team against primary clinical sources — FDA labeling, peer-reviewed trials, and specialty-society guidelines.
Content current as of June 2026; updated when guidance or availability changes.
GLP-1 receptor agonists mimic glucagon-like peptide-1, a gut hormone released after eating. They work through three main pathways: (1) Slowing gastric emptying — food stays in the stomach longer, prolonging fullness. (2) Suppressing appetite in the brain — they reduce the constant 'food noise' many patients describe, making it easier to eat smaller portions and skip snacks. (3) Improving insulin response — they enhance glucose-dependent insulin release, which helps with blood sugar control. Tirzepatide (Mounjaro/Zepbound) additionally activates GIP receptors, producing stronger appetite suppression and weight loss than GLP-1 alone in head-to-head trials.

Where to start

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  • Ro logo

    Ro

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    Ro Body — branded GLP-1 weight care program

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  • Hims logo

    Hims

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    Hims Weight Loss — compounded GLP-1 from $199/mo

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  • Noom Med logo

    Noom Med

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    Noom Med — GLP-1 + behavioral psychology coaching

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Drugs referenced

Related questions

  • Wegovy vs Zepbound: which is more effective?

    In separate Phase 3 trials, Zepbound (tirzepatide 15mg) produced ~20% mean body weight loss vs Wegovy (semaglutide 2.4mg) at ~15%. A head-to-head trial (SURMOUNT-5) confirmed Zepbound's edge. That said, individual response varies widely: some patients lose more on semaglutide than tirzepatide, others tolerate one's side-effect profile better than the other.

  • How much weight can you lose on Wegovy?

    In the STEP-1 trial, adults on Wegovy 2.4mg weekly plus lifestyle changes lost approximately 15% of body weight on average over 68 weeks, vs ~2.4% in the placebo group. About one-third of patients lost ≥20%. Real-world outcomes are typically somewhat lower than trial results because adherence, dose escalation pace, and lifestyle support vary. Most patients s

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