Digestible Indispensable Amino Acid Score

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Digestible Indispensable Amino Acid Score (DIAAS) is a protein quality method proposed in March 2013 by the Food and Agriculture Organization to replace the current protein ranking standard, the Protein Digestibility Corrected Amino Acid Score (PDCAAS). The DIAAS accounts for amino acid digestibility at the end of the small intestine (= the end of ileum, the last section of the small intestine), providing a more accurate measure of the amounts of amino acids absorbed by the body and the protein's contribution to human amino acid and nitrogen requirements. This is in contrast to the PDCAAS, which is based on an estimate of total protein digestibility over the total digestive tract. Values stated using PDCAAS generally overestimate the amount of amino acids absorbed.

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