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This is the most famous but ridiculously arbitrary rule of thumb that has been hammered into most of us since childhood. Professor Heinz Valtin even went as far as an article published by the American Physiological Society on the Lack of scientific evidence for the popular axiom.
The truth is, your actual needs can be more than either glasses or less, and there is no magic number, and the amount changes daily based on your height, weight, ambient temperature, daily activities, and most importantly, your food.
So how much water should we drink? Before all of this science, people relied on a fairly fine-tuned, reliable mechanism to make sure they were getting enough water. It’s called thirst, and you may have heard of it. Drink enough to quench your thirst, and That’s good enough.
