Cats can eat purple sweet potatoes in moderation. Purple sweet potatoes are a nutritious food, containing protein, fiber, vitamins, and minerals. These nutrients can help with a cat's growth and development. However, cats have a lower capacity to digest plant-based foods, so while purple sweet potatoes can be a good supplementary food for cats, it is not recommended to feed them excessive amounts.

Feeding your cat too much purple sweet potato may cause indigestion, vomiting, diarrhea, and other symptoms, and may also affect their appetite, even leading to picky eating and refusal to eat cat food. Therefore, if you plan to feed your cat purple sweet potato, it is recommended to consult a veterinarian first and give it to them in appropriate amounts based on their specific condition.