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Additionally, consuming whey protein resulted in a significantly smaller waist circumference compared to a carbohydrate-treatment group, researchers said.
In a recent study published in The Journal of Nutrition, researchers determined that whey protein, but not soy protein, successfully altered body weight and body composition in overweight and obese adults.
The double-blind, randomized clinical trial gave subjects either, 1) a whey protein beverage, 2) a soy protein beverage, or 3) an isoenergetic amount of carboyhydrate (CHO). The treatments were consumed twice daily, for 23 weeks. The protein beverages provided 56 g/day of protein.
At the end of the study, the whey protein group showed a 1.8-kg difference in body mass and a 2.3-kg difference in fat mass lower than the CHO group. However, there was no difference in body mass or composition between the soy protein and CHO groups.
“Additionally, consuming whey protein resulted in a significantly smaller waist circumference compared with the group consuming supplemental CHO. This is important, because the amount of intra-abdominal adipose tissue is more significantly correlated with metabolic complications in obese individuals than is subcutaneous fat,” the researchers stated.