PDCAAS value of protein (protein digestibility
corrected amino acid score)
A PDCAAS value of 1 is the highest, and 0 the lowest. The table shows the ratings of
selected foods.[2][3][4]
1.00 casein (milk protein)
1.00 egg white
1.00 soy protein
1.00 whey (milk protein)
0.92 beef
0.91 soybeans
0.78 chickpeas
0.76 fruits
0.73 vegetables
0.70 Other legumes
0.59 cereals and derivatives
0.42 whole wheat
Other popular methods- biological value, protein efficiency ratio
For food that have low PDCAAS, combining sources can be very effective. Grain
protein (0.4-0.5, limited by lysine) combined with white bean proteins (0.6-0.7, limited
by methionine) gives a PDCAAS of about 1.0. (Note, PDCAAS are capped at 1.0, so
proteins that have good quantities of all essential amino acids max out on the scale.)