A high-protein diet induces sustained reductions in appetite, ad libitum caloric intake, and body weight despite compensatory changes in diurnal plasma leptin and ghrelin concentrations.

By D. Weigle, P. Breen, C. Matthys, H. Callahan, Kaatje E. Meeuws, V. Burden, J. Purnell. American Journal of Clinical Nutrition, 2005

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High-fat diet-induced obesity in animal models (2010, background): “High-protein diets were also found to increase cholecystokinin and decrease plasma levels of the orexigenic hormone ghrelin((110,111)), reduce gastric emptying((111)) and increase central nervous system leptin sensitivity((109,112)).”
Scientific Opinion on Dietary Reference Values for protein. (2012, background): “However, these studies are difficult to interpret with respect to whether the effects observed are due to an increase in dietary protein intake or to the concomitant modification of carbohydrate and/or fat intakes, and whether any observed effect of an increase in dietary protein intake would be sus”