People are just so stupid that they think they can do better than nature. Just because something LOOKS like food does not mean it IS food. I'm pretty sure they put sawdust in some foods already, like McDonald's milkshakes. Those are not nutritious.

The reason is that companies want to make money selling food products to people and they don't care how sick the people get because they also sell them health insurance and pills. It's pure evil, really.