From the other side of the consultation, briefly. 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.
One concrete data point for the thread. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.
A narrower follow-up, since the general answer is now clear:
How would you tell the difference between that and the alternative explanation?
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View ResultsDr.NateNeph said:For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine.
Worth saying that the confident version of this is more useful to the person writing it than to the person reading it.
Moderator note: reminder that nothing in this thread is medical advice, and that clinical claims need a source. Tagging this one for the weekly digest.