With all the different brands of cat food available, I never really thought about whether there was a difference in the nutritional content between brands. When my kitty was diagnosed with cancer, I very quickly realized that these food significantly vary in there quality and nutritional value. I had been feeding my cats "Its a good life recipe", because they had enjoyed the taste a great deal. My question is what is a nutritionally healthy cat food - which provides all the nutrients needed for a longer and happier life? Is it imperative that I spend a fortune on the EVO grain free food or are my cats going to be fine on the commerical brands (e.g. purina, iams, etc.)? I just want to know if I have been feeding my babies horrible burger king level foods, and if so what is the health food equivalent? Thank you!