Innova EVO is grain free. Canned tuna, chicken, turkey and other meats are typically grain free. Cat food isn't magic. Cats eat meat. Find meat that's as lightly-processed as possible and feed it to your cat. If you're worried about things like taurine content, supplement with a quality vitamin, and possibly add a little vegetable matter to your cat's meaty diet (though be careful - some vegetables like onions are toxic to cats).
Keep in mind that people successfully kept cats healthy feeding them table scraps for decades, if not centuries. If the food is of sufficient quality for you to eat, and it doesn't explicitly make cats sick the way onions or chocolate can, I can't think of anything better to be feeding them.
Clearly most of the pet food industry is far more focused on marketing and profits than they are on supplying a safe, reliable product. If they can't keep from poisoning our pets, it doesn't say much for the nutritional value of their product, either.
Keep in mind that people successfully kept cats healthy feeding them table scraps for decades, if not centuries. If the food is of sufficient quality for you to eat, and it doesn't explicitly make cats sick the way onions or chocolate can, I can't think of anything better to be feeding them.
Clearly most of the pet food industry is far more focused on marketing and profits than they are on supplying a safe, reliable product. If they can't keep from poisoning our pets, it doesn't say much for the nutritional value of their product, either.