Almost a decade from now, some people argued that water could do miracles. You can use it in the losing weight fast battle. If you drink enough water each day, you will lose appetite and start on losing weight. The exact amount of water is three glasses before each meal. Water will dissolve your gastric acid and food will be harder digested. In this way, the fat will be hardly deposited on your body. The disadvantage is that this diet takes longer to show any result.