Ich glaube, es geht denen auch eher um die "anti-nutrients", die in nicht gekochtem / fermentiertem Soja (also zum Beispiel Proteinisolat) enthaten sind:

Soy and anti-nutrients: Trypsin inhibitors? Phytic acid? No, these aren't characters from the new Shrek movie. These are anti-nutrients found in soy foods. The good news is that they're deactivated by cooking and fermentation. So, consumed cooked and fermented soy foods won't inhibit protein and mineral absorption.