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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.
This type of FOS is not natural. Most is manufactured using a chemical process, in which fungal enzymes are added to white sugar (sucrose), acting upon it and turning it into FOS. Some fructooligosaccharides are also made by the hydrolysis (breaking down) of inulin from chicory.his type of FOS is not natural. Most is manufactured using a chemical process, in which fungal enzymes are added to white sugar (sucrose), acting upon it and turning it into FOS. Some fructooligosaccharides are also made by the hydrolysis (breaking down) of inulin from chicory.