Another related study shows that adding fat to protein doesn’t slow or stop Muscle Protein Synthesis (Gorissen SHM1, Burd NA1, Kramer IF1, van Kranenburg J, Gijsen AP, Rooyackers O, van Loon LJC. Co-ingesting milk fat with micellar casein does not affect postprandial protein handling in healthy older men. Clin Nutr. 2017 Apr;36(2):429-437.).
Co-ingesting milk fat with micellar casein does not impair protein-derived phenylalanine appearance in the circulation and does not modulate postprandial myofibrillar protein synthesis rates.