The presence of food residue in the stool is considered normal and is related to the speed of eating, food, and indigestion. It is normal to find more food residue in the stool, and it is related to eating too fast, swallowing without chewing too much, which can lead to excessive food residue and elimination with the stool. The diet often eat black fungus or fibrous food, these foods are inherently tough, not chewed and swallowed directly, will lead to food residue inside the stool. Some people eat more binge eating, the intestines and stomach can not fully digest and absorb the food, food will be quickly through the intestines out of the body, so there will be food residue in the stool. If a normal diet also appears stool food residue, it can be considered that the gastrointestinal tract is not digested caused by the situation. After ingesting food with indigestion in the stomach, the gastrointestinal tract is weak in digestion and absorption, which causes food to be excreted from inside the stool in its original form.