Q. Does the “soybean” (and hence products like soy milk) contain all the essential amino acids, thereby making it a "complete" protein? – Judy
A: This question has been debated for years. Though the humble soybean does contain all 20+ amino acids and is therefore considered complete, the body doesn't appear to "use" protein from soy the same way it uses animal proteins. Additionally, it isn't a source of B12 (also provided by animal protein). Nonetheless, soy can fill a person's protein needs (body weight x 0.8 = # of grams from protein required daily). However, please be cautious not to overdo it. Try and stick to organic forms of soy (i.e. soy beverages and tofu) as well as fermented soy products such as tempeh and miso. Rotate soy with other foods (i.e. use a soy product every other day) and avoid 'junk foods' containing soy and processed soy (e.g. veggie dogs) because there is a tendency is to develop an allergy to soy if it's overused.
