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Fructooligosaccharides (FOS) are short and medium chain sugar molecules that your body cannot digest. FOS passes through your stomach and into your intestines where beneficial bacteria (also known as probiotics) and yeast feed on them.There, they help you digest food, cleanse your system, and enhance your immunity.ructooligosaccharides (FOS) are short and medium chain sugar molecules that your body cannot digest. FOS passes through your stomach and into your intestines where beneficial bacteria (also known as probiotics) and yeast feed on them.
On the other hand, inulin and fructooligosaccharides belong to fructans. Fructans are long chains of fructose units obtained from plants. The difference between inulin and FOS is that the former is long chain fructans while the latter is short chain fructans. Probiotics and fructans are a part of a healthy diet. They are derived from whole foods, fruits, and fermented foods. Advantages of Prebiotics, Inulin, and FOS Boosts Digestive Health. Inulin and FOS are classified as dietary fiber.