Fiber makes the best colon cleansing diet. First of all water can be absorbed by it and secondly it behaves like a broom, cleaning and brushing away the gastrointestinal track. In the medical terms, fiber fermentation helps in increasing the production of acetate, butyric and proprionate acids. Besides it also helps in reducing colon pH, which helps in reducing colon disease. Many of the dieticians even recommend herbs for e.g. Cascara sagrada constituting anthraquinone aglycons, which helps in stimulating large intestine contractions and Plantago ovata etc which reduces the transportation time to the colon from the intestines. Psyllium Plantago ovata is also used in laxatives.