Generally speaking, eating Oreos may result in black stools. Oreo contains chocolate ingredients, if you eat too much at one time, the chocolate can not be digested and absorbed by the stomach in time, the chocolate that is not digested and absorbed in time will be excreted with the stool, forming black stool. However, if you stop eating Oreos for a few days, your stools will return to normal. If it is still black, we should be alert to the existence of gastrointestinal bleeding, and need to go to the hospital in time for examination. At the same time, in our daily life, we often eat pig blood, duck blood and other blood products, or pig liver and other animal offal, as well as iron to replenish the blood of food, medicine, may lead to our stool is black. If you exclude the above conditions, accompanied by stomach discomfort, you need to go to the hospital as soon as possible to do gastroenteroscopy, clear the cause of the disease as soon as possible, so as to avoid delaying the condition.