I’m not even a subject matter amateur, much less an expert, but possibly a contributing factor? I’ve read we don’t have dedicated moisture sensing nerves – our bodies use cold sensing nerves (and some others?). It’s not the most accurate sometimes. Maybe cold water results in higher activation of a “there is water” response.
I googled it to see if there’s any evidence. It seems easily provable/disprovable. Couldn’t find any, but there’s a previous thread that says it is psychologically, but not physiologically, more hydrating.
https://www.reddit.com/r/askscience/s/OkhPUbCV9Y
This is a learned response, in cultures that don’t drink cold water, they do not feel the same response.
You have come to associate drinking cold water with being able to take a break from, or the end of, whatever physical exertion you were undertaking. That association is where the “feels like heaven” part is coming from.
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