Soy protein can be included in black bean burgers bought and distributed through USDA programs. It isn't mandatory.

we bought more than 80 different processed foods containing corn or soy between April and July 2014. (Corn and soy are the two most widely grown genetically engineered crops in the U.S.) We tested ...

Children who eat foods containing soy have better cognitive ability - such as problem-solving and memory - thanks to ...