One study published in the American Journal of Clinical Nutrition showed that eating a high-protein meal led to greater reductions in levels of ghrelin, the hormone responsible for stimulating hunger, than a high-carb meal. It also slowed gastric emptying, resulting in increased satiety. (
1) Another study from the University of Washington School of Medicine found that upping protein intake by just 15 percent decreased daily caloric intake by 441 calories and caused a significant reduction in body weight and fat mass. (
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