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The researchers studied 48 adults ages 55 to 75. All of the subjects were asked to consume a low-calorie diet for 12 weeks, but half also drank two 8-ounce cups [2 x 2,4 dl] of water just before each meal. After 12 weeks, those who drank the water lost about 15 1/2 pounds [7 kg], compared to only 11 pounds [5 kg] for those who did not drink the water.