I think you're right on with your train of thought. Biologically speaking, cats weren't meant to eat the carbohydrates that come in cat food.

I had a cat who - unbeknownst to me at the time - developed feline diabetes. I was shocked to find out that it's quite common in cats which got me to thinking. The common denominator for cats as well as humans with adult onset diabetes is ...carbohydrates!

The link here has some good suggestions for lower carbohydrate brands of food for cats. It's not that expensive to feed a cat real meat so chicken or turkey would be a good option too.

Karen