Cats can eat sweet potatoes, but only in moderation and when cooked plain without any seasonings, oils, or additives. Sweet potatoes are not toxic to cats and can provide some vitamins and fiber, but because cats are obligate carnivores, they do not need sweet potatoes for nutrition. Feeding too much can cause digestive upset or contribute to obesity. It is best to offer small amounts of cooked, peeled, and mashed sweet potato as an occasional treat, not as a regular part of their diet.