Its the petty foodie companies, we is a battlin' mol.
Its for the convience of the consumers, and some guy, way back when, who figured out, a way, to make money, because....... the average joe consumer, is stupid, and will believe, what he is told.
Way back when, kitties and doggies ate table scraps, milkey from the cows, or caught prey, on the prarie. Some guy, had the brite idea, to make commercial cat and dog food, hmmm, how is he going to make it, at a cheap price, and make money, hmmm, let me think, ah duh, make it with corn and grains, then heavily market it, as a convience to the consumer.
They ben doin' it, ever since, cause, the consumer, is stupid.