All our cats have come from the Humane Society where they were fed Purina One Salmon & Rice. That is all the first two ate their entire lives. Herman was just a kitten when he arrived and the vet recommended supplementing with some wet food to aid “brain development” so he grew up on a mixed diet. Now that he’s almost 17 and diabetic he mostly eats the RX wet food with his trusty Purina One (senior) available for snacking.