Why is fiber so important if it just passes through our digestive system?
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For the same sort of reason that a squeegee is important for cleaning windows even though it only scrapes the water off. Or a sponge is important when washing dishes.
(Insoluble) Fibre has a bulk that fills your intestines. As the muscles controlling your gut force this lumpy stuff through it, it “scrapes” off fecal matter that might be clinging to the walls, as well as polyps that are growing in there as well.
Imagine how dirty a tea cup would get if you only ever rinsed it out with more tea. Now imagine that you used a tea-soaked sponge to rinse it out. Imagine how much cleaner it would be.
Now imagine that the cup is your intestines, the sponge is fibre, and the tea is diarrhoea. (I couldn’t resist, because it is gross and true).
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