Medical weight loss
Weight Loss with GLP-1 Treatment
GLP-1 treatment can produce substantial weight loss, but the percentage in a trial is an average over many months. Your progress depends on the medicine, dose, health history, and whether you can continue treatment. The first few weeks usually involve adjusting to a starting dose.

Put trial results in their original context
| Trial | Average change from starting weight |
|---|---|
| STEP 1: semaglutide 2.4 mg weekly, 68 weeks | 14.9% loss with semaglutide; 2.4% with placebo. Both groups received lifestyle support. |
| SURMOUNT-1: tirzepatide weekly, 72 weeks | 15.0%, 19.5%, and 20.9% loss with 5, 10, and 15 mg; 3.1% with placebo. All groups received lifestyle support. |
These were separate trials with different participants and schedules. Their averages cannot establish which medicine will work best for one person. They also do not describe every current dose or tablet formulation. Both trials included a gradual dose increase and continued treatment for more than a year.
A percentage refers to starting body weight. For example, 10% of 200 pounds is 20 pounds. That arithmetic helps interpret a study result; it is not a prediction of your outcome. People in the same treatment group lost different amounts, and some stopped because of adverse effects.
Judge progress over a treatment period
A low starting dose allows the body to adjust. Appetite and weight may change early, but an early week with little change does not establish that treatment has failed. Dose increases follow the prescribed schedule and can be delayed when digestive effects are difficult.
At follow-up, review the weight trend alongside waist measurements if useful, blood pressure, diabetes control where relevant, daily functioning, and adverse effects. The prescriber should explain when to assess response and which changes would justify continuing, adjusting, or switching treatment. Stopping rules vary by product.
A plateau is a reason to review the whole plan. Check adherence, dose, nutrition, other medicines, and whether the achieved weight loss is helping health. A higher dose needs a clinical reason and acceptable tolerability; it should not be chosen solely to chase a weekly number.
Reduced appetite still requires enough nourishment
The weight-treatment labels combine medicine with a reduced-calorie diet and increased physical activity. If appetite becomes so low that you regularly miss meals or cannot drink enough, contact the team. Persistent vomiting, dizziness, or weakness needs assessment.
- Discuss a realistic eating plan that includes protein-containing foods and adequate fluids.
- Review activity that is suitable for your health and current ability, including strength work where appropriate.
- Ask for dietary support if nausea, constipation, food avoidance, or an eating-disorder history complicates treatment.
- Report loss of strength or difficulty with normal activities alongside the weight change.
Make a maintenance plan before treatment ends
In an exploratory STEP 1 extension, 327 participants were followed after study medication and lifestyle support stopped. One year later, participants previously taking semaglutide had regained about two-thirds of their earlier weight loss on average. The study shows what happened in that group after both parts of the intervention ended; it does not predict every person's course.
Weight medicines are often used for ongoing treatment of a chronic condition. Discuss duration, affordability, pregnancy plans, and reasons to stop before an interruption becomes urgent. If medication ends, arrange follow-up and support for weight and related conditions. Do not improvise a taper, restart dose, or substitute product without instructions.
Sources
References cited in this article.
- 1. Once-weekly semaglutide in adults with overweight or obesity: STEP 1New England Journal of Medicine (2021)
- 2. Tirzepatide once weekly for obesity: SURMOUNT-1New England Journal of Medicine (2022)
- 3. Wegovy prescribing informationDailyMed
- 4. Zepbound prescribing informationDailyMed
- 5. Prescription medications to treat overweight and obesityNIDDK
- 6. Weight regain after semaglutide withdrawal: STEP 1 extensionDiabetes, Obesity and Metabolism (2022)