Effects of differing phenolic content in dietary olive oils on lipids and LDL oxidation: A randomized controlled trial

• Published in: European journal of nutrition Vol. 43; no. 3; pp. 140 - 147
• Main Authors: MARRUGAT, Jaume, COVAS, Maria-Isabel, FITO, Montserrat, SCHRÖDER, Helmut, MIRO-CASAS, Elisabet, GIMENO, Eva, LOPEZ-SABATER, M. Carmen, DE LA TORRE, Rafael, FARRE, Magi
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.06.2004; Springer Nature B.V
• Subjects: Antioxidants - metabolism; Biological and medical sciences; Cholesterol, HDL - blood; Cross-Over Studies; Dose-Response Relationship, Drug; Double-Blind Method; Feeding. Feeding behavior; Fundamental and applied biological sciences. Psychology; General pharmacology; Humans; Lipoproteins, LDL - chemistry; Lipoproteins, LDL - metabolism; Male; Medical sciences; Middle Aged; Olive Oil; Oxidation-Reduction; Pharmacognosy. Homeopathy. Health food; Pharmacology. Drug treatments; Phenols - pharmacology; Phenylethyl Alcohol - analogs & derivatives; Phenylethyl Alcohol - urine; Plant Oils - chemistry; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Lipids; Oxidation; Olive oil
• ISSN: 1436-6207; 1436-6215
• DOI: 10.1007/s00394-004-0452-8

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. 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.