Let me preface this by saying I am a vet assistant who has taken feline nutrition courses. What you need to do is to find a food, (doesn't have to be weight control, but that isn't a bad idea) that has a lower kcal/cup range than what you've been feeding. The ideal weight for a cat is to be able to feel the ribs, but not see them, and their ribs need to be easily felt. I don't think lowering the carbs is necessarily going to have a huge impact, unless the lower k/cals per cup food is just naturally lower in carbs.
I suggest using Blue or Nutro if you can go that route as far as price range. Nutro offers lite foods for weight loss. Also in the pet food world (I just learned this) "Lite" means there is a lower calorie content per cup, "Light" just means the actually food pellets are lighter in weight. Might not be a bad idea to ask your veterinarian what a good weight range would be for your cat as well. Animals lose weight like we do, slowly but surely. Sometimes it can take months for a pound to come off, just like us. There will be directions on the side of the bag for how much you should feed per day and you should split that up into three meals if that's possible for your schedule!
I hope this helps!
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Last edited by tessendicott; 07-27-2012 at 11:38 PM.