Another major class of prebiotics are the polyphenols concentrated in fruits and vegetables.7557 Those who discount the power of polyphenols often refer to studies showing their low bioavailability. Up to 85 percent of the polyphenol pigments that make blueberries blue do not get absorbed and end up in our colons, for example,7558 but more advanced detection methods have recently shown that the majority of polyphenols may be absorbed after all.7559 And our colon may be exactly where some of the magic happens.
