Soybeans have long been recognized as plant food that when compared with other plants is relatively high in protein. Protein is the reason that soybeans have historically been called the meat of the field or meat without bones. Even though soy protein is a plant protein and typically lower in certain amino acids and protein building blocks than animal proteins like those found in chicken eggs or cow's milk once adjustments have been made for digestibility and other metabolic factors soybeans turn out to receive a protein quality rating that is equal to the ratings for egg or cow's milk.