An interventional trial in which older individuals were randomized to swap out some low-polyphenol snacks for foods like berries and dark chocolate experienced a significant increase in good (butyrate-producing) bacteria and a bolstering of the gut barrier.7567 However, polyphenol-rich beverages probably provide the best proof. Tea leaves and coffee beans have a lot of polyphenols that end up in the brew, whereas the fiber is completely left behind. Both green tea7568 and coffee7569 are bifidogenic. Three cups of coffee a day can raise Bifidobacteria levels in the gut significantly within
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