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Fructooligosaccharides (FOS)

Updated 3/9/2026
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Digestion
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Research Summary

Fructooligosaccharides (FOS) are a type of short-chain carbohydrate and prebiotic fiber naturally occurring in plants such as chicory root, onions, garlic, asparagus, and bananas. They are composed of fructose units linked together by beta-bonds that the human body cannot break down. Because of their mild sweetness (30-50 percent as sweet as table sugar) and low-calorie profile, FOS are frequently used as functional food ingredients and dietary supplements to support intestinal health and as a healthy sugar alternative.

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