Dietary proteins must be completely hydrolyzed to free amino acids,because only free amino acids are absorbed by the enterocyte.

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While it is true that free amino acids are absorbed by the enterocyte, dietary proteins do not have to be completely hydrolyzed to free amino acids for absorption. Partially hydrolyzed peptides and larger polypeptides can also be absorbed by the enterocyte through specific transport mechanisms. Once inside the enterocyte, these larger molecules are further broken down into free amino acids before being released into the bloodstream.

Dietary Proteins Must Be Completely Hydrolyzed to Free Amino Acids,because