tern for children aged 2-5 y is set too high then this would give the protein a lower numerical value for the score than would be
obtained via a feeding-metabolic study. Because lysine is most
likely to be the first limiting amino acid in diets that are based predominantly on cereal grains (30) it is important to determine
more accurately the lysine content of the reference amino acid
requirement pattern. The reference amino acid pattern used to arrive at the
PDCAAS predicts that in addition to cereals, well-processed soy
protein products, such as isolated soy proteins ( 18), would have a high nutritional value. We have reviewed this topic in detail
and have concluded that soy flour and soy isolates, when they
are the sole or major source of protein in diets containing ade
quate energy and other essential nutrients, are fully capable of promoting adequate growth in young infants (17, 18). For cx
ample, Torun (3 1) gave graded amounts of one of two soy-pro
.