The scientific name of the old woman is dandelion, which is widely distributed in rural areas. It is rich in protein, vitamin B/C, carotene, calcium, phosphorus and iron. It has unique nutritional value, and has the functions of clearing away heat and toxic materials and treating liver-fire diseases. According to modern research, dandelion root extract has the function of inhibiting and killing cancer cells. But people with chronic gastroenteritis should not eat dandelion, otherwise it may cause diarrhea.