the BRAT diet: bananas, rice, apple sauce, and toast. The BRAT diet is a diet for patients with gastrointestinal distress such as diarrhea, indigestion, and/or gastroenteritis. The BRAT diet is a bland diet that consists of foods that are low in fiber. Low-fiber foods were recommended as it was thought that foods high in fiber cause gas and possibly worsen gastrointestinal upset. An acronym, BRAT is a mnemonic for bananas, rice, apple sauce, and toast, the staples of the diet.