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Average flavonoid intake over the 3 days low- and high-polyphenol diets in younger (n = 8) and older (n = 13) participants. Each circle indicates the estimated average daily flavonoid intake for each participant after low- and high-polyphenol diets. Median flavonoid intake for each group is indicated by a red horizontal line. a, b symbols indicate differences within group (LPD to HPD; p = 0.000)
