A normally functioning gastrointestinal system is essential for the digestion of food and the absorption of nutrients. Nutrition therapy is essential in preventing, managing, and treating severe and chronic gastrointestinal conditions. Further, it also helps in treating the deficiencies and malnutrition that occur due to the disease of the stomach and small intestine. It is important not to overburden the gastrointestinal tract with food. An expert nutritionist should be consulted regarding the appropriate type of food to be consumed in gastrointestinal diseases.