How good is soy protein?
Soy protein is the only plant protein that is equivalent to animal protein. Soy protein contains all the nine essential amino acids. The U.S. Department of Agriculture evaluates protein quality using the Protein Digestibility Corrected Amino Acids Score (PDCAAS). PDCAAS measures the amino acid pattern of proteins and factors in digestibility. Soy protein has a PDCAAS score of 1.0, equivalent to animal protein such as casein (milk protein). Animal proteins are considered to be better in quality compared to plant proteins.
