One of the best known diarrhea diets is the BRAT diet because it works. BRAT stands for bananas, rice, applesauce and toast. Rice, applesauce and toast should be plain with no added sugars or fats. All of these foods are high in fiber, which adds bulk to the stools. They are gentle on the stomach to allow your upset stomach and intestines time to heal. The BRAT diet is recommended for both children and adults, but talk to a doctor for diarrhea in children or diarrhea that lasts more than a few days for adults.