Effect of relaxing bowels and slimming: Sweet potato is rich in dietary fiber and oligosaccharides, which is beneficial to the health care of large intestine. Eating more sweet potatoes can reduce plasma cholesterol, reduce subcutaneous fat and prevent obesity. Because of its large size and outstanding satiety, it will not form overeating phenomenon. At the same time, its cellulose can not be absorbed in the intestine, which has special functions of preventing sugar from transforming into fat, promoting defecation and improving constipation.