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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.
Of these foods the sunchoke or Jerusalem artichoke and its relative, the yacon yacÃ³n have the highest concentrations OF. Fos you will also find that-fructo oligosaccharide or, oligofructose as it is also, known is added to many processed, foods mainly as a prebiotic or fiber supplement but also as a. sweetenert is also classed as an oligosaccharide; oligo meaning few and saccharide, sugar. Fructooligosaccharides are also sometimes called oligofructose. Often the term is abbreviated to the letters FOS. Together with inulin fiber, fructooligosaccharides are probably most recognized for their prebiotic qualities.