Make sure you choose a food that's nutritionally geared to your cat's age (kitten, adult, or senior).
Cats who are overweight or underweight need different nutrition than those who are not. Choose a food that fits your cat's needs, whether it's weight control, maintenance, or another formula.
If your cat has medical conditions such as diabetes, allergies, cancer, or digestive difficulties, you'll need to choose a food that is appropriate for that condition
Simply put, feed your cat the best food you can afford. Generally, the more you spend, the better-quality, healthier food you'll feed your pet.