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9. Drink Water as an "Appetizer"

You'll wind up eating less without giving it a thought. People who drank 16 ounces (2 cups) of water 30 minutes before breakfast went on to eat an average of 74 fewer calories during just that meal, in a study in the Journal of the American Dietetic Association. Meanwhile, a study in Obesity found that people who drank water before their biggest meals of the day lost about 9 pounds after 12 weeks without changing anything else about their diet.