How Much Weight Can You Lose on a GLP-1? Honest Numbers
The honest answer is a range, not a promise. Here is what the research shows, what we see in clinic, and the factors that decide where in the range you land.
The short answer
In the major trials, people on semaglutide lost an average of about 15 percent of their body weight over roughly a year and a half, and people on tirzepatide lost more, often in the range of 20 percent or higher at the top doses. For a 230 pound person, 15 to 20 percent is roughly 35 to 46 pounds. These are averages: some people lose more, some less, and individual results vary and are not guaranteed.
Semaglutide vs tirzepatide, by the numbers
Semaglutide acts on one appetite pathway (GLP-1); tirzepatide acts on two (GLP-1 and GIP), which is why its average results tend to be higher. In head-to-head terms, semaglutide commonly lands around 15 percent average body-weight loss and tirzepatide around 20 percent or more, though the right medication for you depends on your health, tolerance, and goals, not just the average.
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Start the 30-day trialWhat decides where you land in the range
- Reaching an effective dose. Results build as the dose is titrated up; stopping early at a low dose usually means less loss.
- Consistency. The biggest difference between average and disappointing results is sticking with the weekly dose and the plan.
- Protein and activity. They protect the muscle that keeps your metabolism up, so more of what you lose is fat and the result lasts.
- Starting point and biology. Higher starting weight often means more total pounds lost; age, hormones, and other factors shift the pace.
How fast does it come off?
Most people notice reduced appetite within the first few weeks, and steady weight loss over 3 to 6 months and beyond as the dose increases. A healthy, sustainable pace (rather than the fastest possible drop) protects muscle and is far less likely to rebound. We would rather you reach and hold a healthier weight than hit a number fast and regain it.
Keeping it off
The numbers above are the loss phase. Keeping the weight off is a separate, equally important phase: a maintenance dose or a supervised taper, plus the nutrition and activity habits built along the way. That is why we plan for maintenance from day one.
Frequently asked questions
How much weight can you lose on semaglutide?
In the major trials, average loss was about 15 percent of body weight over roughly 68 weeks, which is around 30 to 35 pounds for a 220 to 230 pound person. Individual results vary: reaching an effective dose, staying consistent, and protecting muscle with protein and activity all push you toward the upper end. Results are not guaranteed, and a physician sets the plan for your situation.
How much weight can you lose on tirzepatide?
Tirzepatide acts on two appetite pathways and tends to produce more loss than semaglutide, often around 20 percent of body weight or higher at the top doses in trials. For many people that is 40 plus pounds, but the average hides a range, and the right medication and dose depend on your health and tolerance, not just the headline number. Individual results vary.
How fast will I lose weight on a GLP-1?
Most people feel reduced appetite within the first few weeks and see steady loss over 3 to 6 months and beyond as the dose is titrated up. A deliberate, sustainable pace protects muscle and is less likely to rebound than a rapid crash. The exact pace depends on your dose schedule, consistency, and body, which is why supervised follow-up matters.
Why do some people lose more than others?
The main drivers are reaching an effective dose, staying consistent week to week, and protecting muscle with enough protein and some activity. Starting weight, age, hormones, sleep, and other medications also shift results. None of it is a willpower verdict, it is biology plus the plan, which is exactly what a physician-supervised program is built to optimize.
Will I gain the weight back?
Some regain is common if the medication is stopped abruptly with no plan, because appetite returns. It is not inevitable: a maintenance dose or gradual taper, plus the nutrition and activity habits built during the loss phase, make lasting results realistic. Planning maintenance from the start is part of how we protect your numbers.
This article is informational only and not medical advice. Speak with a licensed physician before starting or changing any GLP-1 therapy. Individual results vary. New Hope Weight Loss is a physician-supervised medical weight loss clinic in Costa Mesa, CA. Eligibility for treatment is determined during the medical consultation. Compounded semaglutide and compounded tirzepatide are not the same products as Wegovy®, Ozempic®, Mounjaro®, or Zepbound®.