That's why I usually try to go for cat food that's primarily meat, even though it does have other stuff like carrots and peas and other veggies. And it's not like cats can't eat veggies (whenever we go out for Chinese, I have to ward my kitties away from the carrots in my stir-fried veggies X'D), it's just that meat has to be a primary part of their diet. Same with dogs and some reptiles like snakes.