Since we humans are not likely to taste the cat food that we buy (at least I'm not), we can only go by the list of ingredients and the cat's response to determine if our choice is a good one. In my cat's case, she appears to adore the taste of Hill's Science Diet Optimal Care and her vet visits suggest that this brand is keeping her in ideal shape. My only concern is that she loved it so much that she tended to overeat and we had to switch to the light formula. Persia would gobble this dry kibble nearly as happily as she does her canned food. The list of ingredients are good, although not as optimal as the all-natural and organic brands. I'd say it's better quality than Purina but not as good as Blue Buffalo. As far as Science Diet being a healthy choice, all I can say is that it makes Persia's coat soft and shiny and she is in fabulous health for a kitty her age (nearly 8). Overall, I would absolutely recommend Science Diet Optimal care for an adult cat. My only caution would be to make sure your cat gets enough exercise because she may like it a little too much!