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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.
2.3 Fructose (also known as levulose or fruit sugar). Fructose, a monosaccharide, is very similar to another monosaccharide, galactose. These two simple sugars share the same chemical formula; however, the arrangements of their chemical groups along the chemical chain differ.arbohydrates, also known as saccharides, are classified according to the number of single carbohydrate molecules in each chemical structure.