Janet A Novotny1, Tzu-Ying Chen2, Anton I Terekhov2, Sarah K Gebauer1, David J Baer1, Lap Ho3, Giulio M Pasinetti3, Mario G Ferruzzi4. 1. US Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Building 307B, BARC-East, Beltsville, MD, USA. 2. Department of Food Science, Purdue University, West Lafayette, IN, USA. 3. Icahn School of Medicine at Mount Sinai, Department of Neurology, New York, NY, USA. 4. Department of Food, Bioprocessing, and Nutrition Sciences, North Carolina State University, Kannapolis, NC, USA.
Abstract
SCOPE: Evidence suggests that dietary pattern may affect polyphenol absorption and/or metabolism. Further, obesity is associated with lower circulating nutrients, though the reason is unclear. We investigated the pharmacokinetic (PK) response of polyphenols in obese/overweight versus lean individuals before and after repeated dosing of grape polyphenols. METHODS AND RESULTS: A pilot study was conducted in which PK challenges were administered before and after 10 days of repeated dosing with polyphenols. Volunteers (6 lean, 6 overweight/obese) consumed resveratrol, grape seed extract, and grape juice (2125 mg total polyphenols) daily. On days 1 and 11, blood samples were collected for 6 h after the polyphenol dose and analyzed for deconjugated catechin, epicatechin, resveratrol, and quercetin. Area under the plasma polyphenol mass by time curves (AUCs) were greater for catechin, epicatechin, and quercetin on day 11 versus day 1 for low BMI individuals (p = 0.039) but not high BMI individuals. Further, AUCs were greater for epicatechin and resveratrol for low versus high BMI individuals (p = 0.041), with a similar trend for catechin (p = 0.065), on day 11 but not day 1. CONCLUSION: These results suggest that that obesity and repeated exposure may modify polyphenol absorption and/or metabolism in humans.
SCOPE: Evidence suggests that dietary pattern may affect polyphenol absorption and/or metabolism. Further, obesity is associated with lower circulating nutrients, though the reason is unclear. We investigated the pharmacokinetic (PK) response of polyphenols in obese/overweight versus lean individuals before and after repeated dosing of grape polyphenols. METHODS AND RESULTS: A pilot study was conducted in which PK challenges were administered before and after 10 days of repeated dosing with polyphenols. Volunteers (6 lean, 6 overweight/obese) consumed resveratrol, grape seed extract, and grape juice (2125 mg total polyphenols) daily. On days 1 and 11, blood samples were collected for 6 h after the polyphenol dose and analyzed for deconjugated catechin, epicatechin, resveratrol, and quercetin. Area under the plasma polyphenol mass by time curves (AUCs) were greater for catechin, epicatechin, and quercetin on day 11 versus day 1 for low BMI individuals (p = 0.039) but not high BMI individuals. Further, AUCs were greater for epicatechin and resveratrol for low versus high BMI individuals (p = 0.041), with a similar trend for catechin (p = 0.065), on day 11 but not day 1. CONCLUSION: These results suggest that that obesity and repeated exposure may modify polyphenol absorption and/or metabolism in humans.
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