“Using the responses of more than 18,000 adults in the National Health and Nutrition Examination Survey 2005–2012, the scientists found that people who increased their plain water consumption by 1 percent reduced their total daily calorie intake. Specifically, people who drank one to three cups of plain water—either spring or tap water, water from a drinking fountain or a water cooler, or bottled water—tended to reduce their “empty-calorie” intake from sweetened foods and beverages. They also consumed less total fat, saturated fat, sugar, sodium and cholesterol. The average person in the study drank slightly over four cups of water a day. Each cup of water, up to three cups, correlated to about 68 fewer calories consumed.”
Source: Water: a Key Ingredient in Recipe for Weight Loss: Health After 50