Rubbish. Overhydration is a thing. Too much water will supress your appetite (and even if you're trying to lose weight, you still need to eat!). http://www.myfitnesspal.com/topics/show/898354-myth-drink-8-glasses-of-water-a-day-to-lose-weight http://www.myfitnesspal.com/topics/show/821181-myths-and-facts-about-hydration-requirements http://butterbeliever.com/8-reasons-not-to-drink-8-glasses-of-water-a-day/ http://www.goodhealthinfo.net/drink_more_water_myth.htm Here's a better idea: listen to your body. If it says it's thirsty, and water is what it needs, you drink it.Drink half your body weight in water.