Acute intake of quercetin from onion skin extract does not influence postprandial blood pressure and endothelial function in overweight-to-obese adults with hypertension: a randomized, double-blind, placebo-controlled, crossover trial
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To determine whether postprandial metabolic and vascular responses induced by a high-fat and high-carbohydrate meal are attenuated by ingestion of the flavonol quercetin.
Twenty-two overweight-to-obese hypertensive patients participated in a randomized, double-blind, controlled, crossover meal study. They consumed a test meal (challenge) rich in energy (4754 kJ), fat (61.6 g), saturated fatty acids (53 % of total fatty acids), and carbohydrates (113.3 g) with either placebo or 54 mg quercetin. Blood pressure, reactive hyperemia index (RHI), high-sensitive C-reactive protein (hs-CRP), soluble endothelial-derived adhesion molecules, parameters of lipid and glucose metabolism, and markers of antioxidant status were measured before the meal and at 2 and 4 h postprandially.
Systolic and diastolic blood pressure increased significantly over time, but were not affected by treatment (placebo or quercetin). During both treatments, serum endothelin-1, intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and plasma asymmetric dimethylarginine slightly decreased over time, whereas RHI increased. Serum triglycerides, total cholesterol, and insulin significantly increased, whereas HDL cholesterol and glucose significantly decreased over time, again with no effect of treatment. Plasma α-tocopherol significantly increased, and plasma Trolox equivalent antioxidative capacity decreased over time. Serum hs-CRP, plasma retinol, and β-carotene did not significantly change during the trial.
In hypertensive patients, a high-energy meal did not lead to postprandial impairment of vascular endothelial function. Postprandial metabolic responses induced by the challenge, such as lipemia and insulinemia, were not attenuated by the concomitant ingestion of quercetin.
KeywordsQuercetin Blood pressure Postprandial metabolism Cardiovascular diseases Endothelial function
High-sensitive C-reactive protein
Peripheral arterial tonometry
Reactive hyperemia index
Soluble endothelial selectin
Soluble intercellular adhesion molecule-1
Soluble vascular cell adhesion molecule-1
Trolox equivalent antioxidative capacity
The authors are indebted to our volunteers for their interest and participation in our study; to Rudolf Wild GmbH & Company KG (Matthias Saß) for the supply of the onion skin extract; to Petra Pickert, Margret Schüller, Christel Bierschbach, Adelheid Schuch, Anke Ernst, Petra Schulz, Anke Carstensen, and Ute Hartung for excellent technical assistance; and to Sarah Krönung, Elvis Kolobara, Claudia Pagliarucci, Lisa Albrecht, Ramona Napp, and Michael Napp for performing the venipunctures. This study was supported by Grant No. EG292/3-1 of the German Research Foundation (to SE).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The study was conducted according to the guidelines laid down in the 1964 Declaration of Helsinki, and its later amendments and all procedures involving human participants were approved by the ethical committee of the Medical Faculty of the Rheinische Friedrich-Wilhelms-Universität Bonn, Germany. Written informed consent was obtained from all participants.
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