Eating foods such as apples, dragon fruit, celery, and black fungus can help cleanse the intestinal tract. Apples are rich in water-soluble dietary fiber, pectin, and various vitamins. Eating apples regularly can not only supplement the body’s nutrients, but also promote intestinal peristalsis and adsorb harmful substances in the intestines, so it can achieve the role of cleaning the intestines. Dragon fruit is rich in nutritional value, dragon fruit seeds can also promote intestinal peristalsis, to help the intestinal feces discharge, so there is a good role in cleaning the intestines. In addition to lowering blood pressure and blood fat, the dietary fiber in celery also has a laxative effect, so eating celery properly can promote colon peristalsis and assist in the elimination of waste from the colon. Black fungus can not only replenish iron, but also contains gelatinous substances that can absorb toxins in the digestive system. Eating black fungus regularly not only helps to cleanse the intestines, but also improves the immunity of the body and has an inhibitory effect on digestive tumors.