Effects of differing phenolic content in dietary olive oils on lipids and LDL oxidation
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Evidence from in vitro studies suggests that antioxidant olive oil phenolic compounds can prevent LDL oxidation. However, in vivo evidence in support of this hypothesis is sparse.
Aim of the study:
to establish the antioxidant effect of olive oils with differences in their phenolic compounds content in humans
A controlled, double blind, cross-over, randomized, clinical trial using three similar olive oils with increasing phenolic concentration (from 0 to 150 mg/Kg) was conducted in 30 healthy volunteers. Olive oils were administered over three periods of 3 weeks preceded by two-week washout periods.
Urinary tyrosol and hydroxytyrosol increased (p < 0.020), in vivo plasma oxidized LDL decreased (p = 0.006), and ex vivo resistance of LDL to oxidation increased (p = 0.012) with the phenolic content of the olive oil administered. After virgin olive oil administration, an increase (p = 0.029) was observed in HDL cholesterol levels.
Sustained consumption of virgin olive oil with the high phenolic content was more effective in protecting LDL from oxidation and in rising HDL cholesterol levels than that of other type of olive oils. Dose-dependent changes in oxidative stress markers, and phenolic compounds in urine, were observed with the phenolic content of the olive oil administered. Our results support the hypothesis that virgin olive oil consumption could provide benefits in the prevention of oxidative processes.
- Effects of differing phenolic content in dietary olive oils on lipids and LDL oxidation
European Journal of Nutrition
Volume 43, Issue 3 , pp 140-147
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- Print ISSN
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- olive oil
- phenolic compounds
- oxidized LDL
- Mediterranean diet
- HDL cholesterol
- Industry Sectors
- Author Affiliations
- 1. Lipids and Cardiovascular Epidemiology, Research Unit, Institut Municipal d’Investigació Mèdica, Carrer Dr Aiguader 80, 08003, Barcelona, Spain
- 2. Universitat Autònoma de Barcelona, Barcelona, Spain
- 3. Pharmacology Research Unit, Institut Municipal d’Investigació Médica, Barcelona, Spain
- 4. Dept. of Nutrition and Bromatology, Pharmacy Faculty, University of Barcelona, 08028, Barcelona, Spain
- 5. Universitat Pompeu Fabra, Barcelona, Spain