Beets are a healthy choice for adult cats, especially because they contain a lot of antioxidants and folate. Despite their high fiber content and low-calorie content, they are packed with several important nutrients. Beets also support digestive health by preventing diarrhea and constipation. They may also protect the cardiovascular system and provide an important source of vitamin A and C. However, be sure to avoid consuming large amounts of beets as they can cause diarrhea and indigestion in cats.