Lean meats such as chicken fish and yes turkey are a great addition to your cats diet. Yes your cat can absolutely share your turkey dinner but with a few stipulations. So when your little guy brushes up against your leg at thanksgiving it is more than likely okay to drop him a piece of turkey or two.
Turkey is also low in carbs and calories. Because it is low in fat it is a good treat that will help them to avoid excessive weight gain. As obligate carnivores it is important for cats to have a healthy allotment of meat as their key source of protein. Their systems or ours really arent designed to handle all that.