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@deleted
This is true. I have made a previous error.
the big book of endocrinology, contradicts the previous statement I made and removed.
However, if we went on whatever a caveman did, what is the point in any of this 'science'.
Thirst is still not reliable enough, if you want proper hydration.
thirst is reliant on 2 major hormones:
ADH and Angiotensin 2.
ADH will be released more during exercise, causing you to overhydrate potentially.
As well as the fact as stated above that it is too late a sense of when you are actually dehydrated as it is in response to a 2-3% drop in osm, whereas a smaller change will cause adverse effects. And/ or a 15% decrease in BP.