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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.
High-fructose corn syrup contains the manufactured version and is added to processed goods. Fructooligosaccharides, or FOS, are growing in popularity as a prebiotic fiber that may have helpful intestinal benefits. But before you buy supplements, you should know research on FOS is somewhat conflicted.hoto Credit Photos.com/PhotoObjects.net/Getty Images. High-fructose corn syrup and fructooligosaccharides both derive from fructose, the little sugar that's hailed in its natural form in fruit and honey but villainized as a chemically produced added sugar.