Tio: So are you saying the majority of your cats diet is rice and vegetables? I certainly hope this is not the case as your cat can form many deficiencies on that food, it's not healthy for him, cats are carnivores.
As far as going on a diet, pick a good food with a meat meal (aka chicken, turkey, lamb meal) as the first ingredient at least. And a food with 3% fiber or less. Feed this dry food 3x a day split up into small meals, slowly decrease the amount you feed, and then slowly change the meals to only 2 times a day, continue this until your cat has reached a proper weight.
You can follow the same pattern with wet food as well. If you need a separate list for wet food I'd be more then happy to give that to you.
You also must follow up by having your cat exercise, this is very important not only for loosing weight, but for your cats over all health. Most people think of cats as lazy little fur bags, but in actuality a healthy cat should be fairly active every day.
Frist Grade Cat Food:
By Nature - BrightLife
Chicken Soup for the Cat Lovers Soul - Adult, Kitten
Evolve - Kitten, Maintenance
Newman's Own Organics - Cat/Kitten
TimberWolf Organics - Serengeti Herbal
Second Grade Cat Food:
Nature's Recipe - Adult
Lick Your Chops
Third Grade Cat Food:
Breeders Choice - Avo-Derm
Bil - Jac
Flint River Ranch
Natural Life - Adult, Kitten
Nutro Natural Choice
Wysong - Uretic, Vitality