FOS are short-chain prebiotic fibers that promote beneficial gut bacteria growth.
Fructooligosaccharides (FOS) are short-chain soluble fibers composed of 2-10 fructose molecules that function as prebiotics by selectively feeding beneficial gut bacteria. Like inulin, FOS are largely indigestible by human enzymes but fermented by gut microbiota.
Fructooligosaccharides are oligosaccharides—short chains of fructose molecules—that are naturally present in many plant foods and are also produced commercially from sucrose or inulin. Like inulin, FOS cannot be digested by human enzymes and therefore reach the colon intact, where they serve as selective food for beneficial bacteria such as Bifidobacteria. The fermentation of FOS by these bacteria produces short-chain fatty acids, particularly butyrate, which support intestinal barrier integrity and overall metabolic health. FOS are often used as food additives to increase the prebiotic content of commercial products.
FOS function as a prebiotic to stimulate beneficial bacteria proliferation, improve mineral absorption, and support immune and digestive health.
Consume 3-10 grams of FOS daily from natural food sources or fortified products, increasing gradually to minimize digestive discomfort. Choose whole food sources whenever possible, as they provide additional nutrients alongside the prebiotic benefits.
FOS are practical prebiotics that enhance gut microbiota balance and support digestive and metabolic health.
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