Eating undigested directly out, may be related to the following conditions: 1, may be related to the food eaten, some food itself should not be digested, absorption, coupled with eating faster, did not chew carefully, eating a relatively large amount of indigestion. 2, may itself gastritis, enteritis, gastrointestinal plant neuropathy, etc., resulting in gastrointestinal dysfunction, indigestion caused. Intestinal peristalsis is too fast, the food is too late to digest and absorb directly out. 3, other diseases such as intestinal polyps, intestinal flora dysbiosis, etc., will also appear this situation. Long-term so easy to cause malnutrition, so timely treatment, organic lesions promptly remove the cause, and pay attention to eat good digestion, easy to absorb, low residue food, appropriate to strengthen nutritional intake, pay attention to supplement protein, vitamins and trace elements.