Dietary fiber prebiotic effect

The dietary fiber prebiotic effect refers to the selective fermentation of indigestible carbohydrates, such as fructans, galacto-oligosaccharides (GOS), resistant starch, and inulin-type fructans, by beneficial gut bacteria in the colon. These fibers resist hydrolysis by human small intestine enzymes and reach the large intestine intact, where they are metabolized primarily by Bifidobacterium and Lactobacillus species via saccharolytic pathways, producing short-chain fatty acids (SCFAs) like acetate, propionate, and butyrate. SCFAs lower colonic pH, provide energy to colonocytes, enhance intestinal barrier integrity, modulate immune responses, and improve mineral absorption, contributing to overall host health. This effect influences microbiota composition, suppressing pathogens and promoting cross-feeding among beneficial microbes, with applications in preventing dysbiosis-linked conditions like obesity, inflammation, and metabolic disorders. Unlike molecular targets such as receptors or enzymes, it represents a functional process rather than a specific biomolecule, limiting direct pharmacological modulation but supporting dietary interventions.

Other names

Prebiotic effect of dietary fiberPrebiotic dietary fiberPrebiotic fermentation by dietary fiber