Here's one I found online: Ingredients: 1/2 pound ground beef or turkey 1 small carrot -- finely grated 1 tablespoon cheese -- grated 1 teaspoon brewer's yeast 1 teaspoon dried catnip 1/2 cup whole wheat bread crumbs 1 egg -- beaten 1 tablespoon tomato paste Directions: Preheat oven to 350 degrees. In a medium sized bowl, combine the meat, carrot, cheese, brewer's yeast, catnip and bread crumbs. Add the egg and tomato paste and mix well. Using your hands, roll the mixture into walnut - sized meatballs and place on a lightly greased cookie sheet. Bake for about 15 minutes until the meatballs are brown and firm. Cool the meatballs completely before storing in an airtight container in the refrigerator. These also freeze well. Note: Not sure about the brewer's yeast since some cats have reactions to it.

If one needs to lose weight and one needs to "bulk up," the only way you can do that is to feed them separately, in different rooms. If the overweight cat is gorging himself, you may have to physically remove him to give the little one a chance to eat. I've heard you can also train cats to eat in their carriers.