How much weight will I lose on tirzepatide?
Average in the SURMOUNT-1 trial was 15 percent at 5 mg, 19.5 percent at 10 mg, and 20.9 percent at 15 mg over 72 weeks. The real-world range is wider because 45 percent of trial users discontinued. Your result depends on dose, adherence, protein intake, and resistance training.
The trial numbers
SURMOUNT-1 (NEJM 2022, 2,539 participants, 72 weeks) reported mean weight loss of 15 percent at the 5 mg target dose, 19.5 percent at 10 mg, and 20.9 percent at 15 mg. Placebo lost 3.1 percent. These are averages. The distribution is wide: roughly a quarter of users lost more than 25 percent, roughly a quarter lost less than 10 percent.
What the marketing skips
Three numbers that rarely appear in commercial content. First, 45 percent of SURMOUNT-1 participants did not complete the 72-week trial, mostly due to GI side effects. Second, 25 percent of what you lose is lean mass (muscle + water) unless you intervene with protein + resistance training. Third, SURMOUNT-4 showed 14 percentage points of regain on average within 12 months of stopping.
What you can control
Your result depends heavily on protein intake (aim for 1.6 to 2.2 g/kg target weight) and resistance training (minimum 2 sessions per week). Both protect lean mass. Neither is optional if you care about body composition rather than scale weight. Our detailed guide on muscle loss + protein covers the exact protocol.
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