Cassava can be eaten, but it is not recommended to eat raw, because raw or eat uncooked cassava can be harmful to the body. Tapioca, also known as cassava, cassava contains carbohydrates are relatively high, while containing protein, fiber and calcium, magnesium and other trace elements. Every 100 grams of cassava contains 119 calories, of which 27.8 grams of carbohydrates, 2.1 grams of protein, 0.3 grams of fat, vitamin C35 mg, calcium 88 mg, iron 2.5 mg. Proper intake of this food can replenish the nutrients needed by the organism. But the food needs to be eaten cooked, not raw. Cassava contains a high concentration of cyanogenic glycosides, generally degradation can produce hydrocyanic acid, because raw or improperly handled the food, will lead to poisoning symptoms. The less severe cases will have headache, vomiting, and the more severe cases will have difficulty in breathing, coma or death. If raw cassava is consumed, it is recommended to seek medical attention as soon as possible.