"Thirst and hunger are easily confused because the side effects—fatigue, light headedness, an empty stomach—are similar," says Nolan. Even if you don’t feel thirsty, gulping water before breakfast, lunch, or dinner can help control how much you eat. A study by the American Chemical Society found that subjects who swigged two cups of water right before eating a meal ate 75 to 90 calories less during that meal.
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