From the day Chloe came into our adult cat family we struggled with her only eating the adult food. I don't understand what it was but I finally had to talk to our vet and find out what way to do things. She said that since she was taking an interest in the adult food that she would be just fine growing on that. I just supplimented her food with wet kitten food 2 times a day for the extra vitamins and let her help herself to the big kitties food. My vet said the same thing its o.k. for Chloe our youngest to eat the adult food Very bad for the older cats to eat the kitten food. Too many calories and vitamins may cause issues with the urine. Hope it helped.