The Specific Carbohydrate Diet is a strict diet used to help manage Crohn’s disease, ulcerative colitis, IBS, celiac disease, diverticulitis and other digestive conditions. It was made popular by nutritionist Elaine Gottschall after she used it to manage her small daughter’s debilitating illness.
It is called the specific carbohydrate diet because it only allows monosaccharides (carbs with a single molecule structure that allow them to be easily absorbed by the intestine wall). Complex carbohydrates, which are disaccharides (double molecules) and polysaccharides (chain molecules), are not allowed. As an example, honey (monosaccharide) would be allowed but maple syrup (a disaccharide) would not be allowed on the SCD diet.
There is a lot more information about the diet here.
These are the SCD cookbooks I’ve tried and loved: