drinking too much water will deplete essential "elements" or im not sure the word im looking for but bottom line drinking too much water will goof up the "balance" of the key factors that keep the "chemistry" in your body in sync.. it flushes out sodium and potasium and so forth and ive been witness to problems that arrise from too much water intake in my mom, my gma a great aunt & a cousin and its quite an ordeal and can take time to undo it & get things right again & can cause a snowball of new problems that will begin due to it and/or take an awful toll on causing any current problems to get worse than they already were..