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Whey ProteinWhey protein has been studied extensively as a high quality protein source that contains a balanced profile of essential amino acids important for stimulating protein synthesis and a positive protein balance. While this is important for building muscle, there may be other reasons that whey protein could benefit people. One of the reasons diets with higher protein content can be effective in promoting weight loss is because protein is more satiating than either carbohydrate or fat. But not all proteins have the same satiating effects. Researchers from the Netherlands compared the effects of whey, casein and soy on several markers of appetite including actual caloric intake. Subjects were fed a 600 calorie breakfast with either 10% or 25% of the meals consisting of a different protein source. When protein was 10% of the breakfast meal, whey decreased hunger more than soy and casein. At the higher protein intake, there were no differences. Although not significant, the amount of food consumed 3 hours after breakfast was lowest after the whey protein breakfast. The findings provide clear evidence that different proteins affect appetite differently, and whey appears to reduce hunger the most when consumed with breakfast. This appears to be linked to the amino acid levels and appetite hormones in the blood.

Veldhorst MA, Nieuwenhuizen AG, Hochstenbach-Waelen A, van Vught AJ, Westerterp KR, Engelen MP, Brummer RJ, Deutz NE, Westerterp-Plantenga MS. Dose-dependent satiating effect of whey relative to casein or soy. Physiol Behav. 2009 Mar 23;96(4-5):675-82.