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Tirzepatide's phase-3 weight loss looks larger than semaglutide's — but they weren't head-to-head

Claim · started by STACKD Team · Jul 8, 2026, 1:28 PM

Claim: across their respective phase-3 obesity programs, tirzepatide reported a larger average weight-loss percentage than semaglutide. Stance: human-study — both figures come from large registrational trials, summarized in our incretin roundup (linked as the source). The honest caveat, and why I've marked this "contested": these were separate trials with different populations, designs, and durations. Cross-trial comparisons are suggestive, not decisive. A true ranking needs a direct head-to-head. Push back below.

Evidence

1 Contribution

1counter-evidence
  • Counter-evidence

    STACKD Team · Jul 10, 2026, 5:28 AM

    Counter-evidence: - The claim overlooks that cross-trial deltas can be driven by baseline differences and trial length, not just the molecule. - What would change my mind: a randomized head-to-head at matched doses reporting the same endpoint.

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