Background: Bacteria that live inside the stomach and intestines are important for health. Chronic granulomatous disease (CGD) and inflammatory bowel disease (IBD) can make people have unhealthy bacteria. This can lead to gastrointestinal (GI) problems. Researchers want to see if people with CGD and IBD feel better when they change the bacteria in the stomach by following a special liquid diet. Objective: To see if an elemental diet can change the bacteria in the stomach and intestines of people with CGD and IBD. Also, to see if this helps GI symptoms. Eligibility: People ages 8-65 years with CGD, CGD-associated colitis, and IBD. Design: Participants will first be screened with: Upper GI endoscopy and/or colonoscopy. A long, thin tube with a tiny camera at the end will be passed into the participant s body through the mouth or anus. Tissue will be collected. Participants will be sedated for the procedure. They will be sedated using a special mask or small plastic tube placed in an arm vein using a needle. Participants will be put on the special diet for up to 4 weeks. They will stay in the hospital for up to 2 weeks. They will have check-ups. They will have blood, urine, and stool samples collected. They will keep a symptom diary to record how they feel and any GI symptoms. Participants will have 2 follow-up visits. The first will be right after they finish the diet. The second will be 4 weeks later. They will have blood, urine, and stool samples collected. They will learn about re-introducing other foods into their diet.
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Change in the relative abundance of proteobacteria in stool samples obtained after elemental diet.
Timeframe: Day 56