DIAAS (Digestible Indispensable Amino Acid Score)

The protein quality evaluation method recommended by FAO/WHO, replacing PDCAAS. DIAAS measures true ileal digestibility of individual indispensable amino acids and expresses protein quality relative to a reference amino acid pattern for a specific age group. Unlike PDCAAS, DIAAS does not cap at 1.0, allowing meaningful distinction between high-quality proteins. Generally, dairy proteins score higher than plant proteins under DIAAS.