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Dietary Fiber or Prebiotic
A collection of non-digestible carbohydrates that pass through our intestines to be excreted unaltered or fermented by intestinal microbes. They can have mechanical properties (e.g., gel forming), prebiotic effects, and/or may serve as a substrate for the production of short-chain fatty acids via fermentation within the microbiome.
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"Dietary Fiber or Prebiotic," Examine.com, published on 14 November 2013, last updated on 13 July 2018, https://examine.com/supplements/dietary-fiber-prebiotic/