Kalou,
My knowledge is more with canines, but IMO most grains (including corn) are not suitable in a diet for a dog or a cat, but especially a cat because they are strict carnivores. It's not that corn is necessarily bad, just inappropriate in a carnivore's diet.
There are much better foods you can find for your cat. Most of the users on here like Orijen. Their website is www.orijen.ca. I feed my dogs Orijen and they do wonderfully on it. They have a Cat & Kitten formula, and a 6 Fish Cat.
Hopefully, some cat owners will be along soon to provide more advice. 
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My babies: Sassy - Maltese X (9), Furby - Shihtzu X (7), Brynn - Boxer (3), Diesel - Boxer (1)
"Many of the Earth's habitats, animals, plants, insects, and even micro-organisms that we know as rare may not be known at all by future generations. We have the capability, and the responsibility. We must act before it is too late." - Dalai Lama
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