I am feeding Blue Buffalo Basics grain-free formula, which is better in MY OPINION than Iams, Royal Canin, and Science Diet, because my cats are no longer vomiting or having loose stools on the Blue like they were on the other foods. However, is Blue Buffalo a premium food? What makes a food premium or not premium? Can any food claim to be premium on their label, or do they have to show proof that they are using quality ingredients?