Consuming foods and beverages such as raw fruits and vegetables, chocolate, milk, prune juice, and beer can cause diarrhea after bowel surgery, including a bowel resection or an ileostomy, states MedlinePlus. A patient may also experience diarrhea if the surgery involved removing a large section of small intestine.
Patients who experience diarrhea need to drink clear fluids and fluids with sodium and potassium for a short while, skip solid foods, and consult their physicians, notes MedlinePlus. After bowel surgery, patients need to reintroduce foods to their diets one or two at a time. Eating several small, bland meals daily, equally spaced in time, and taking in plenty of protein aids recovery and reduces the possibility of experiencing loose stools.