Dr.ObesityLA said:

Worth answering the question that was asked rather than the one behind it.

I read this differently from Dr.ObesityLA, on substance rather than tone. Pushing back on the anecdote-stacking. Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.

Adding the numbers, since they settle part of this. If you are going to change something, change one thing and give it long enough to express itself. Four weeks is the usual minimum for anything pharmacological on this board, and two weeks of data has told you almost nothing.

labquiet_amy said:

Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.

Adding the part of the answer the thread has not reached. Start from the measurement rather than the conclusion. Almost every disagreement here turns out to be two people measuring different things and comparing the numbers anyway.

Following on from traveltech_sara — and this may be the naive question:

What did you change at the same time, and can you separate the two now?

Closing the loop on my own question.

Update, and it is the boring outcome: nothing was wrong. The measurement I was reading had moved less than its own week-to-week variation, which somebody said upthread and I did not believe.