What it means
Plateaus are normal. As you get lighter, you burn fewer calories, your everyday movement may drop and the deficit that worked at first shrinks.
In GLP-1 trials, average weight loss slowed and leveled off over time. With semaglutide and tirzepatide, the curve tended to flatten somewhere after the first year, though individual results varied a lot.
Before deciding you have hit a plateau, look at the trend over 3 to 4 weeks, not day to day. Water, salt, hormones and bowel habits can hide fat loss on the scale for a while.
If a plateau lasts longer than a month, review the basics: portions creeping back up, fewer steps, less sleep, or more liquid calories. Your prescriber can help decide whether anything else should change.
Why it matters
Knowing when the curve flattens helps you judge whether your progress is on track.