I really never thought that cat food was that different. I only have had indoor/outdoor cats and they like to catch many wild things , in addition to their cat food, and have always eaten whatever s in their bowl. I love my cat(s) but felt cat food is cat food and get the treats at times and am not adverse to a bite of peanut butter or whatever we are eating. I now know that Pro Plan does something different because when my cat 's bowl is low and I add cat food she isn't satisfied if she knows the Pro Plan bag is stiil around. The flavor s and nutrition as well make a difference to my cat , and although I felt cat food is cat food , I believe as an instinctual animal she must know that there s more to Pro Plan. She has never been that picky with the " regular" brands that I would circulate ( based on sales price, coupon ...). Pro Plan is a food she looks forward to- gets excited about and says something for cats like I've had that can catch their own "fresh" food.