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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.
(Note the thick arrow in thediagram.)The most important regulator of phosphofructokinase is fructose-2,6-bisphosphate, which is produced by a separate enzyme. Fructose-2,6-bisphosphateincreases the affinity of phosphofructokinase for fructose-6-phosphate, and thusacts as a critically important stimulator.ATP inhibits phosphofructokinase,because high levels of ATP indicate that the cell has sufficient energy.Phosphofructokinase is also inhibited by citrate.hile glucose-6-phosphate can be used for a number of other pathways,and the phosphoglucoisomerase reaction is freely reversible, the compound fructose-1,6-bisphosphate is committed to glycolysis. Phosphofructokinase is the primarycontrol point for glycolysis, and is tightly regulated.