Humans require (and like!) carbohydrates in the form of sugars and starches, but cats have no such requirement. This is worth noting when you buy cat food, because canned foods are made of about 10 percent carbohydrates, and dry foods are about 40 percent carbohydrates.
The carbohydrates don’t do any harm, of course, and your cat can metabolize them easily. But in its natural state as a hunter in the woods and fields, a cat wouldn’t take in starches or sugars at all. Also, keep in mind that an excess of carbohydrates will have the same effect on your cat as on you: obesity.