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As I understand it, some studies don’t distinguish low-volume drinking from not drinking.
The quoted portion of the meta-study in the post makes it clear that the studies reviewed did distinguish between low-volume drinking and not drinking.
It wouldn’t surprise me if sample selection not taking into account social factors which would cause people who drink at low volumes to lie and say they don’t drink could play a role in certain studies.
Seems like it’s pretty much like any other surface in your kitchen, it requires regular cleaning.