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Cats will eat grass and plants occassionally, but no they don't require it in their diet at all. Sometimes eating plants or grass is a sign of a deficeincy. The scrap meats are good for them. But, they need several vitamins and minerals, especially taurine and calcium, that they won't get from scrap meats alone. A quality wet canned food, like "Wellness" from Complete Petmart, who sells more holistic foods, is ideal. Plus the scraps. Stay away from dry food. It's terrible for cats and causes tons of urinary problems.
But, it's okay for cats to chew on grass and plants. Sometimes it helps with hairballs too.