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Calculate digestible indispensable amino acid scores (DIAAS), biological value (BV), and net absorbed protein grams across animal and plant dietary protein sources.
Gross Protein (g).Net Usable Protein = Gross Protein × min(DIAAS Score, 1.0).Leucine Grams = Gross Protein × Leucine % (Whey ~11%, Beef ~8%, Soy ~7%, Wheat ~6%).DIAAS (Digestible Indispensable Amino Acid Score) measures true ileal amino acid digestibility at the end of the small intestine for individual amino acids. Unlike PDCAAS, it does not truncate scores at 1.0 and does not count fecal bacterial protein.
Milk Protein Isolate (DIAAS 1.18–1.41), Whey Isolate (1.15–1.33), Whole Eggs (1.18), and Beef (1.10–1.20) lead in true bioavailability and leucine concentration.
Phytates, tannins, and trypsin inhibitors in raw grains and legumes bind to digestive enzymes and amino acids, reducing intestinal absorption by 10% to 30% unless cooked, soaked, or fermented.
Yes. Due to lower individual DIAAS scores and lower leucine concentrations in plant proteins, vegan and vegetarian athletes should consume 10% to 20% higher total protein grams (1.8–2.4 g/kg).