With respect to its effect on colon microflora, fiber is considered a:

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Prebiotics are substances that promote and provide food substrates for beneficial bacteria in the colon. Fiber is one of these substances. Probiotics actually contain beneficial bacteria. Functional foods are specific foods that contain nutrients or other substances that have health benefits. Foods that contain fiber may be examples of functional foods, but fiber itself is not. Fiber does have protective effects in the colon, but this is not a recognized term.

With Respect to Its Effect on Colon Microflora, Fiber Is