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Dr.LipidDallas said:

It helps to ask what evidence would change your mind before you look at any.

There is a second half to this that has not been said yet. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.

Adding the numbers, since they settle part of this. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.

Ask again with the specifics and you will get a better answer than this one.

A narrower follow-up, since the general answer is now clear:

Did your prescriber agree with that reading, and if not what was their objection?

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.

hank_denver said:

The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the…

True, with the qualification that this is a self-selected group. The people for whom it did not work post less, and that shapes everything we think we know.