Cats have a particularly high requirement for protein. Their preference for high-protein food is not a behavioral trait, or taste issue, but a biological imperative. Unlike dogs or humans, a cat requires a diet containing a great deal of fat. A well-balanced diet for a cat would consist of many things such as protein, bones for calcium, fats, starches, sugars, fiber, and vitamins. Here are some guidelines for feeding your cat human food.
Cats can find tuna or liver, for example, very tasty and refuse to eat anything else.
Too much tuna, which is usually packed in thick oil, will rob the cat's body of vitamin E. Liver on the other hand is very rich in vitamin A and too much of this vitamin can be toxic. Milk may not be fine for all cats. Cats may have difficulty digesting milk and can develop diarrhea. Vets suggest you try milk in small amounts but be sure to watch the cat's stool for a day or two. If diarrhea occurs, the cat cannot properly digest the milk.