Usually sweet potatoes can germinate naturally in a suitable environment without the help of nutrients in soil and fertilizer, because sweet potatoes themselves are rich in sugar, water and other nutrients and can feed themselves. Sweet potatoes after sprouting will be cut off the buds can be eaten, but at this time to eat the taste is relatively poor. In addition, if accompanied by spoilage is not recommended to eat. Sprouted sweet potatoes indicate that after picking placed for a long time, sweet potato flesh is not fresh, while sweet potatoes sprouting can lead to the loss of water and sugar within the sweet potatoes. And various nutrients in sweet potatoes will also be absorbed by sweet potato buds, after eating not enough nutrients to provide the body, sprouted sweet potatoes will also produce more fiber, not easy to digest after eating. If there are black spots and mold on the skin of sweet potatoes with long sprouts, it means that there is mold, and should be avoided. Sweet potatoes sprouting does not produce harmful substances, but long-term room temperature environment is easy to mold, and black spots belong to mold, ingestion of toxins, may be harmful to human health. In addition, it is recommended to eat steamed fresh sweet potatoes, better taste, while rich in various nutrients, conducive to human digestion and absorption, beneficial to human health; raw sweet potatoes with high starch content, can not be digested by the body, raw food is easy to cause gastrointestinal discomfort. Also note that you can not eat too much, because the sugar content of sweet potatoes, especially for diabetic patients, excessive consumption may cause abnormal increases in blood sugar.