The researchers presented their findings at the National Meeting of the American Chemical Society in Boston.
All adults who took part in the study were aged 55 to 75.
The first group followed a low-calorie diet but did not drink any extra water before meals.
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People should drink more water and less sugary, high-calorie drinks. It's a simple way to facilitate weight management”
Prof Brenda Davy
Virginia Tech
The second group followed the low-calorie diet but also drank two glasses of water before each meal.