There are days when I don't drink any pure water at all, only 3-4 cups of tea. And I feel fine. When I exercise or work in high temperatures I do drink water, but 64 oz (~1.9 liters)? Nevah. And my pee is a nice light yellow, thank you very much.
I think when you drink so much water most of it goes straight through and takes important minerals and such with it on the way out, and I think you can get the body used to processing a lot of water, making you thirsty all the time, but it's not really healthy. Just my uneducated opinion.
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