| Stools of children with lactose intolerance tend to be acidic and contain undigested sugar. |
| These bacteria feed on undigested food particles and release gases during a process called fermentation. |
| The horses leave bits of grain on the ground after they eat, and some undigested grain shows up in their manure. |
| Intestinal gas is typically caused by the fermentation of undigested food, such as plant fiber, in the colon. |
| And undigested food materials are formed into feces in the intestines and excreted from the body as solid waste in bowel movements. |
| Your body mistakes undigested food particles for foreign invaders and releases antibodies to fight them. |
