By Dr. Mercola The TEDx Talk above, featuring Gerald Pollack, Ph.D., and the two videos that follow, all address the importance of water for biological function and optimal health — and there’s a lot more to this than you might expect. You’re probably well aware of the fact that your body is composed mostly of water, which is needed for a number of physiological processes and biochemical reactions, including but not limited to blood circulation, metabolism, regulation of body temperature, waste removal and detoxification. Once your body has lost 1 to 2 percent of its total water content, it will signal its needs by making you feel thirsty. Using thirst as a guide to how much water you need to drink is one obvious way to ensure your individual needs are met, day-by-day. But did you know there are different KINDS of water? And that a certain type of water is more beneficial, indeed critical, than regular H2O?