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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.
These are complex carbohydrates, or sugars that come naturally from high fiber foods such as garlic, onions, leeks, oats, barley, rye and chicory root. One great thing about fructooligosaccharides is that they help the body make its' own beneficial bacteria in the digestive system.