I need one! Since Spirit (cat) has had a few health problems, I have been supplementing her diet with foods other than Little Friskies. But I have no idea what I am doing, nutritionally.

I have been giving her cooked beef, chicken, fish, chicken livers and half and half/and Lactaid. So far, no problems and she is putting on some needed weight. But am I making health problems down the line? My vet gave me kind of a non-answer.