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First of all, how exactly did mankind 'create' grains? I was under the impression that they were always there, and that humanity developed agriculture so we wouldn't have to forage for the fruits, vegetables and grains that have always been a necessary part of our diet.
Humans are designed to run off of glucose, a carbohydrate. Protein and fat can be converted into glucose for energy, but not very efficiently, and in the long term, can cause ketosis (when the blood becomes too acidic), this is fatal.
Cats and dogs aren't humans. They have evolved to live off of a protein-based diet. I don't know the mechanics of a cat's digestive system, but you don't see feral cats cooking little pots of rice in the wild too often, so it probably means that they don't need carbohydrates.
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