Clinical perspective, offered as context rather than as advice. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
TirzTom 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…
This is exactly what I could not find anywhere else. I will report back once I have actually tried it.
From the other side of the consultation, briefly. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.
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Shop Reference Standardsingrid_STO said:It helps to ask what evidence would change your mind before you look at any.
Second this. The detail I would add is minor and it is already implied above.
Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful.