According to historical records, China's sweet potato was introduced from the Philippines in the Ming Dynasty. Because it comes from a foreign country, it is called Fanbang for foreign history, so it is called sweet potato. Because it is eaten raw, most of the interior is white, also called sweet potato. Red is introduced into some areas, so it is called sweet potato. As for purple potato, it is only a product in recent years, which has blown the anti-cancer effect and nutritional value to the gods. But smart people think about it carefully, and the recent products really don't rule out the genetically modified factor!