Soy protein is the world's least expensive source of protein and therefore has the most potential to feed the world, according to Jeff Rosichan, Novartis's global coordinator of biotechnology. One acre of land planted with soybeans and converted to soy protein will sustain a person 2,234 days. The same acre planted with wheat will sustain a person 877 days. And if the acre crop is used to feed cattle, the beef will sustain a person 77 days.