That's about 2 quarts. However, the overweight person needs one additional glass for every 25 pounds of excess weight. The amount you drink also should be increased if you exercise briskly or if the weather is hot and dry. When the body gets the water it needs to function optimally, it's fluids are perfectly balanced. Endocrine gland function improves.
Fluid retention is alleviated as stored water is lost.
More fat is used as fuel because the liver is free to metabolize stored fat. Natural thirst returns. There is a loss of hunger almost overnight. If you stop drinking enough water you body fluids will be thrown out of balance again, and you main experience fluid retention again, unexplained weight gain and loss of thirst.