It puts stress on all your organs. It's not good to over drink water just like it's not good to under drink. My doctor told me to just go by my pee. If it's yellow, drink. Your pee should be clear. I probably drink about 4 or 5 glasses a day, eat lots of fruit and veggies, 5 cups of coffee, a cup of tea, and that's about it. You get water from food you know, and that counts, it's not in addition to.