The cast of Indigestible - 2014 includes: Susie Coston
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Cellulose is indigestible to humans because it acts as a
hydrophyllic bulking agent to human feces. It is consist of
non-starch polysaccharides. Its a soluble fiber, that's why
cellulose is indigestible.
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cellulose
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Because if you don't eat indigestible material you would be
eating for a long time.