2. For people who are often constipated or have poor digestive system, you can often eat some yam to improve. The cellulose contained in yam can help strengthen the intestinal activity of human body, eliminate toxins in human body, and also help human body reduce the absorption of fat content in food. Therefore, moderate consumption of yam can not only help the human body to relieve digestive function, but also help the human body to reduce the absorption of fat and achieve the effect of losing weight.