The digestion rate of protein is an independent regulating factor of postprandial protein retention.

@article{Dangin2001TheDR,
  title={The digestion rate of protein is an independent regulating factor of postprandial protein retention.},
  author={Martial Dangin and Yves Boirie and Clara L. Garcia-Rodenas and Pierre Gachon and Jacques Fauquant and Philippe Callier and Olivier Ball{\`e}vre and Bernard Beaufr{\`e}re},
  journal={American journal of physiology. Endocrinology and metabolism},
  year={2001},
  volume={280 2},
  pages={
          E340-8
        }
}
To evaluate the importance of protein digestion rate on protein deposition, we characterized leucine kinetics after ingestion of "protein" meals of identical amino acid composition and nitrogen contents but of different digestion rates. Four groups of five or six young men received an L-[1-13C]leucine infusion and one of the following 30-g protein meals: a single meal of slowly digested casein (CAS), a single meal of free amino acid mimicking casein composition (AA), a single meal of rapidly… 
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