 Some cat foods are based on a limited ingredient recipe, whereas others use a plethora of different ingredients. You may find tomatoes in the latter ones. Tomatoes are rich in vitamin C, potassium, and fiber. All of these are essential for kitties of all breeds and ages. However, there are better, meaning more nutritious, sources of these crucial nutrients than tomatoes. In some cases, tomatoes are indeed perfectly safe for cats to eat, whereas in others they pose a toxic danger. Tomato plants, similarly to potato plants, do pose some health risks to cats and other animals. Some toxins found in the tomato plant can cause gastrointestinal complications and other problems.