Ganime, I also agree with the others that you did the right thing by neutering him. This will also make him healthier and happier in the long run. I have 3 male cats and they're all neutered. They still think that they are kittens. I feed them a light formula dry food and I measure the amount that I feed them. My Pepper is a bit overweight but I think that his metabolism is lower than Storm's and Sunny's. Good luck.