Under normal circumstances, if the yam is not cooked, people eat after the general will not cause poisoning phenomenon, because the yam can be eaten raw, and yam eaten raw to ensure that its nutrients do not have to be destroyed, especially some of the yam eaten raw after the human body has a very good nourishing effect, but also has a very good taste, such as the Japanese yam and so on. In addition, yam in the processing time itself can not be overcooked, especially at high temperatures will destroy the yam inside the enzymes and other active ingredients, its nutritional value caused by the destruction, but on the human body is not favorable. But eat yam must be washed, especially in the uncooked or raw yam if the yam is not fresh or contaminated by bacteria, this time will cause food poisoning or cause acute gastroenteritis and other symptoms, should be promptly to the hospital for treatment.