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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.
Fructans are chains of fructose molecules found in fruits and some vegetables and grains, such as wheat and onions (see list below). Both fructose and fructans can cause problems. Fructose Malabsorption Disorder (FM or FructMal) is the inability to absorb fructose and fructans.