i have two cats both are rescued my oldest cat is not fat but boarder line chunky and my second cat is thin i have taken him to the vet to make sure he is OK and the vet said he was healthy, that he was just a thin cat by nature. well that leaves my problem i am looking for the right cat food. one cat needs low calorie the other high becuase he burns it off faster does any one have any suggestions? i am looking for good quality food. that is good for both cats. i worry my younger cat Oreo isn't getting enough nutrition, i have never had a cat that was on the thin side before and any advice on a good nutritional food would be great thanks