The method
Why stalls are normal
Nearly everyone plateaus. A week or two — sometimes longer — where the scale simply won't move is a feature of the curve, not a sign the plan has failed. Knowing that in advance takes most of the sting out of it.
Why the scale flattens
Fat can keep leaving while the scale holds still, because water quietly takes its place. Repairing muscle after exercise, a shift in sodium or carbs, ordinary hormonal cycles — all can mask real loss for days or weeks, until the body "catches up" and the number drops in a step. The loss was happening the whole time; you just couldn't see it.
The pause after a dose change
A flat stretch in the first week or two after a titration change is common as your body re-settles. This is why Light Years' Stall Radar treats a post-change pause differently — it knows the difference between an expected settle and a genuine plateau, so it doesn't cry wolf.
How long is "normal"
A single flat week says very little. The trend across three or four weeks says far more. Most plateaus resolve on their own as the body finishes its adjustment.
When it's worth a conversation
A very long stall, or one paired with symptoms that worry you, is a good thing to raise with your prescriber. That's their call, not an app's — this guide describes general physiology and isn't medical advice.
Light Years draws this for you, quietly. Open the app or browse the other guides.