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The indigestible remainder of the food and the capsule then passed on to the large intestine, where the food was fermented by the gut bacteria.

With their high concentrations of indigestible oils and waxes, these fish are not suitable for human consumption.

Fiber is used as an umbrella term for indigestible plant polysaccharides, so there are many different types with varying fermentability, solubility and viscosity in the gut.

This key genetic factor preferentially enhances the utilization of arabinan -- a common constituent of plant polysaccharides, an indigestible fiber for humans, and a poorly accessible source of nutrients for normal gut microbes.

These indigestible dietary fibres are found in plant-derived foods such as onions, leeks, artichokes, wheat, bananas, and in high concentrations in chicory root.