For 23 weeks, 90 overweight and obese adults were randomly assigned to receive two servings of 200-calorie beverages a day, consisting of either 28 grams of whey or soy protein plus carbohydrates, or carbohydrates only.
At the end of the study, the whey protein group’s body weight and body fat were lower by 1.8 kg and 2.3 kg, respectively, than the carbohydrate group. Waist size was smaller in the whey group than in the other groups.