The laxative effect of vegetables depends on their dietary fiber content, there is no “first place”. Many vegetables are rich in dietary fiber, dietary fiber is a can not be digested and absorbed by the gastrointestinal tract, beneficial to the human body of polysaccharides, can enhance the feeling of satiety after eating, promote intestinal peristalsis, increase the volume of feces, conducive to laxative. In common vegetables, the same weight of different types of vegetables contain dietary fiber ranked in order: 1. Beans: fava beans > chickpeas > mung beans > barley > red beans. 2. Root vegetables: lotus root > celery = string beans = yam = taro > cabbage > broccoli > kale > eggplant > leek > winter melon > enoki mushrooms > celery. The average dietary fiber content of beans is much larger than that of root vegetables. Symptoms of constipation can be improved by improving diet, drinking more water, and appropriate activities. If constipation persists, it is recommended to consult a doctor in time for standardized treatment.