Dr.BariatricHTX said:

Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then…

Mine went the same way, slower.

BethLabQueen said:

One practical note: write down what you did and when, before you need it.

Coming at BethLabQueen’s question from a different direction. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

One concrete data point for the thread. 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.

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

What would you measure differently if you were starting again?

Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. No action needed from anybody.