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There are many higher quality cat foods on the market which you can purchase from small pet stores (not like the big pet stores such as Petsmart or Petco). These foods have none of the corn, corn meal or byproducts that causes allergies in cats. Please read this article and maybe this will help you understand why - http://www.preciouspets.org/truth.htm
Anyway, my girl is horribly allergic to nearly all commercially sold pet foods because of corn or corn meal. I tried some of the premium foods that has worked for her and since then she hasn't one allergic reaction. I know have stayed with Innova EVO. It is expensive, but of higher quality and my cat just loves it. They have turkey, chicken, lamb, venison, etc.
All the vet foods contain corn and byproducts and these are the cause for the allergens. Vets only get one semester of nutrition studies for all animals not just one particular animal so they do not have enough or adequate information on nutrition information. I don't want to diss on a vet, because I trust mine, but he was willing to admit this fact to me.
Note: you still can choose recipes from here that are low in carbs and grains in general!