The specific carbohydrate diet (SCD) is a grain-free, lactose-free, and sugar-free dietary regimen designed for those suffering from Crohn's disease, ulcerative colitis, celiac disease, intestinal bowel disease, and irritable bowel syndrome.
The SCD is "...predicated on the understanding that ulcerative colitis, Crohn's disease, irritable bowel syndrome, and gluten therapy resistant celiac are the consequence of an overgrowth and imbalance of intestinal microbial flora. By altering the nutrition we take in, we can effect the constitution of our intestinal flora, and bring it back into balance, healing our digestive tracts and restoring proper absorption."
Extract from Elaine Gottachall's site