Specializes in diseases and conditions affecting the digestive system, including the stomach, liver, intestines, and gallbladder, as well as managing digestive disorders like IBS and GERD. What is a good treatment for gastrointestinal disease? Treating a GI Disorder Resting and drinking plenty of fluids. Following the BRAT diet – bananas, rice, applesauce and toast – all of which are easy on the stomach and beneficial in their own way. At the same time, avoid things like dairy, grease, and spices, as they can aggravate your digestive system.