FOS
Shorter chains of the same beads. Bifidobacteria love them. Onions and bananas carry some.

What it is
FOS stands for fructooligosaccharides: the short version of inulin. Same fructose beads, same links, but only a few beads long (oligo means few).
Onions, garlic, bananas, asparagus and chicory carry some. FOS can also be made for foods and supplements, from table sugar (by adding fructose beads) or from inulin (by trimming it).
AnnouncerFructooligosaccharides has 22 letters. The crew calls it FOS. So do we.
FOS is inulin’s short cousin: the same fructose beads, only a few links long.
Try your tools on it
Same story as inulin: the links between the fructose beads are a kind your own enzymes can’t cut. FOS reaches the colon intact.
A plate of FOS
glucose fructose
Who eats it, Downtown
Bifidobacteria love it. Short chains are quick to eat, so most of it goes early, near the start of the colon.
What they make
Mainly acetate and lactate from the bifidos, which other microbes turn into butyrate. Short chains ferment fast, so the gas comes sooner too.
Serve the fos to the crew and see what they make.
Coming up next on Channel GG
Polydextrose
A glucose-based fibre, in our probiotic strips.





