The figures, for anyone assembling their own picture. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

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

How would you tell the difference between that and the alternative explanation?

Dr.AddMedPHL said:

Practical: whatever you change, write down the date and the reason.

This is where I part company with the consensus forming above. 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.

Worth separating that from the pharmacology, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.

Dr.AddMedPHL said:

Practical: whatever you change, write down the date and the reason.

Agreed, and the size of the effect matters as much as its existence. Something real and small gets treated here as though it were real and decisive.

That is the short version; the long version is somebody else's post.

Dr.AddMedPHL said:

Practical: whatever you change, write down the date and the reason.

Bookmarking. The distinction being drawn above is the one nobody else makes. Printing the relevant bit and taking it with me.