I do know that you can feed a dog a vegetarian diet and the dog will do fine.  If you do this to a cat, you'll kill it.  Cats need purine in the diet and this comes from fish and chicken.  I am afraid they need to be true meateaters for their own health.

I'll write a friend and see if I can find a site that tells about what not to have around cats.  I keep a parrot (Indian ringneck parakeet).  I have bird safe houseplants.  We let her eat human food because that is best for a parrot with seed as a snack.  She can have anything, but avocado would kill her so those have to be kept out of her flight zone (she is fully flighted and allowed to fly the house).  I don't let her have mushrooms and I try not to give her onions or garlic. I am told that mushrooms aren't toxic for my sweetie, but I am afraid of them for her health.  If we have something with green chilis, the seeds are saved for a treat because they are high in vitamin A and birds can't taste the heat.

I had a cat who insisted on eating anything with garlic.  It didn't matter how hard you tried, she would jump in the trash cans in or out of the house, into the sink, try to get to the stove, you name it, if the food had garlic in it.  I caught her trying to eat whole cloves once!  It can't have been good for her, but if she didn't get it at home, she visited the neighborhood trash cans for it.  It made her sooooo  gassy and nothing is worse than a cat's gas when they insist on eating garlic.  Did I mention she would only sleep at night and in my bed?