What does the STEP 1 curve show at 12 weeks?
It shows an average loss of about 6% of body weight by week 12. STEP 1 enrolled 1,961 adults with obesity, or overweight plus a related condition, and no diabetes. The paper reports that weight loss began at the first check at week 4 and kept going until a low point at week 60. Reading its published curve of observed averages gives this pattern:
| Week | Approximate average weight change, semaglutide | Placebo |
|---|---|---|
| 4 | -2% | -1% |
| 8 | -4% | -2% |
| 12 | -6% | -2% |
| 16 | -8% | -2.5% |
| 20 | -9.5% | -3% |
| 28 | -12% | -3% |
| 52 | -15.5% | -3% |
| 68 | About -15.5% observed; -14.9% in the main analysis | -2.4% |
Most values are read from the published figure, so treat them as approximate. The -14.9% and -2.4% results at week 68 come straight from the paper’s main analysis.
Why is the first 3 months only about 40% of the total?
Because you are not on the full dose yet. The Wegovy label starts at 0.25 mg and steps up every four weeks: 0.5 mg at week 5, 1 mg at week 9, 1.7 mg at week 13 and the 2.4 mg maintenance dose from week 17. Week 12 falls at the end of the 1 mg block. The early steps exist mainly so your stomach can adjust, and the label lets a step be delayed four weeks if a dose is not tolerated.
So six percent by week 12 against roughly 15 percent by week 68 means about 40 percent of the eventual loss happens in the first quarter of treatment, on less than half the maintenance dose. The curve keeps falling steeply through month seven and then flattens toward the end of the first year.
What changes the result for one person?
Averages hide a wide spread. In STEP 1, about 86% of semaglutide participants weighed at week 68 had lost at least 5%, and about a third lost 20% or more, while some lost very little. Factors that shape the first three months include:
- Whether you tolerate each step on time or need to pause one
- How much your eating actually changes, especially portion size and alcohol
- Starting weight, since the same percentage means more pounds for a heavier man
- Muscle and water shifts, which can make the scale jump around week to week
A 20-week run-in in the STEP 4 trial gives another anchor. People who reached the full 2.4 mg dose had lost an average of 10.6% by week 20, which fits the STEP 1 curve.
How should you judge progress at 3 months?
Judge the direction and the dose, not one number. A slower start on a held dose step is common and is not the same as a poor response. Your provider will usually look at weight, waist, how you feel at each dose and whether muscle is being protected. Our page on how long semaglutide takes to work explains what each phase feels like, and the semaglutide dosing schedule lays out the climb in more detail.
Related question: is tirzepatide faster?
On average, yes, though the evidence comes from separate trials. Tirzepatide’s own trial curve was steeper over the same early weeks, and its 72-week averages ran higher at the 10 and 15 mg doses. The full breakdown by dose and by month is in tirzepatide weight loss in a year. Which medicine fits you depends on your history, side effects and goals, not on the steepest curve alone.
What Ultimate Male tracks in your first 3 months
Your first visit at the San Gabriel or Downey clinic includes labs and a body composition analysis, so the 12-week check measures fat and muscle, not just scale weight. A PA-C or MD reviews how each dose step went and whether to move up, hold or adjust, which keeps the pace matched to how you feel.
If your loss slows later in the year, that is a separate conversation, covered in why weight loss stalls on semaglutide. To see whether the medical weight loss program is a fit, start with a free 10-minute call; there is no commitment until you have a plan and a quote.
