Digestion and absorption of dietary protein in man.

Although it has become clear that brush border hydrolysis and consequent utilization of the monosaccharide transport system is the predominant method of absorption of the luminal products of carbohydrate digestion in man, it now appears certain that two major mechanisms are involved in the absorption of the luminal products of protein digestion; on the one hand transport of liberated free amino acids by group specific active amino acid transport systems, and on the other hand uptake of unhydrolysed peptides by mechanisms independent of the specific amino acid entry mechanisms.