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.
Dr.CardioMD said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Same pattern here, and in the same order. The detail I would add is minor and it is already implied above.
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View ResultsOne 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.
If somebody has the primary source to hand I would rather cite it than paraphrase it.