European Journal of Nutrition

, Volume 43, Issue 3, pp 140–147

Effects of differing phenolic content in dietary olive oils on lipids and LDL oxidation

A randomized controlled trial
  • Jaume Marrugat
  • María-Isabel Covas
  • Montserrat Fitó
  • Helmut Schröder
  • Elisabet Miró-Casas
  • Eva Gimeno
  • M. Carmen López-Sabater
  • Rafael de la Torre
  • Magí Farré
  • and the members of the SOLOS Investigators*
ORIGINAL CONTRIBUTION

DOI: 10.1007/s00394-004-0452-8

Cite this article as:
Marrugat, J., Covas, M., Fitó, M. et al. Eur J Nutr (2004) 43: 140. doi:10.1007/s00394-004-0452-8

Summary.

Background:

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

Methods:

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.

Results:

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.

Conclusions:

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.

Key words

olive oilphenolic compoundstyrosoloxidized LDLMediterranean dietHDL cholesterol

Copyright information

© Steinkopff Verlag 2004

Authors and Affiliations

  • Jaume Marrugat
    • 1
    • 2
  • María-Isabel Covas
    • 1
  • Montserrat Fitó
    • 1
  • Helmut Schröder
    • 1
  • Elisabet Miró-Casas
    • 3
  • Eva Gimeno
    • 4
  • M. Carmen López-Sabater
    • 4
  • Rafael de la Torre
    • 3
    • 5
  • Magí Farré
    • 2
    • 3
  • and the members of the SOLOS Investigators*
  1. 1.Lipids and Cardiovascular Epidemiology, Research UnitInstitut Municipal d’Investigació MèdicaBarcelonaSpain
  2. 2.Universitat Autònoma de BarcelonaBarcelonaSpain
  3. 3.Pharmacology Research UnitInstitut Municipal d’Investigació MédicaBarcelonaSpain
  4. 4.Dept. of Nutrition and Bromatology, Pharmacy FacultyUniversity of BarcelonaBarcelonaSpain
  5. 5.Universitat Pompeu FabraBarcelonaSpain