Viscous hydrogel structure

The presence of the complex carbohydrates provides the environment with a viscous hydrogel structure water removal gradually yields a mass of bacteria bound by undigested carbohydrates (celluloses) to form the stool. The presence of a hydrogel softens the mass and also provides water for dissolution. Carbon dioxide release is also a fermentation product, and if the redox potential is sufficiently low, bacteria can produce methane and hydrogen that can be detected in the breath particularly after the ingestion of pulses. In the upright position, the gas will rise to the transverse colon It is estimated that an adult produces approximately 2-3 L per day on 20 g fermentable fibre (most of which is eliminated in the breath). ... 

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