One data point is not a trend
A single week’s weight, especially if it’s unexpectedly higher than the week before, often triggers concern that isn’t warranted once you look at the surrounding weeks. Water retention, a heavier meal the night before, or even just normal day-to-day variation can easily account for a single outlier.
What actually indicates a trend
Looking at a rolling few-week average, rather than any single entry, smooths out normal noise and shows the underlying direction far more reliably than comparing this week to last week in isolation.
When a plateau is actually a plateau
A few consecutive weeks with little to no change is more informative than one flat week, and worth noting as a genuine plateau rather than assuming it’s measurement noise. Even then, a plateau during a GLP-1 course is commonly reported and doesn’t necessarily mean something’s wrong.
Non-scale changes worth tracking too
Clothing fit, energy levels, and other non-weight signals sometimes shift before the scale reflects a meaningful change, which is one more reason a written log with more than just a number is useful.
The practical habit
Look at trends over three to four week windows rather than reacting to any single entry, and keep logging consistently even through a plateau, since the record is what eventually shows whether it was temporary or not.