From the baseline, the excretion of polyphenols in the walnut group in the first year approached significance at a 0.066 p value, but not in the second year or when the values were adjusted for urinary creatinine excretion.
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Effect of Walnut Supplementation on Dietary Polyphenol Intake and Urinary Polyphenol Excretion in the Walnuts and Healthy Aging Study.
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