Olive oil polyphenols enhance high-density lipoprotein function in humans: a randomized controlled trial

Area of Science:

• Cardiovascular Health
• Nutritional Science
• Lipid Metabolism

Background:

• Olive oil polyphenols are linked to cardiovascular benefits.
• Previous studies suggest a connection between olive oil polyphenols and high-density lipoprotein (HDL) cholesterol.
• Limited research exists on how these polyphenols affect HDL quality and function.

Purpose of the Study:

• To investigate if polyphenol-rich olive oil consumption improves HDL's primary function: cholesterol efflux capacity.
• To assess the impact of polyphenol-rich olive oil on HDL quality markers, including polyphenol content, size, and composition.

Main Methods:

• A randomized, crossover, controlled trial involving 47 healthy European males.
• Participants consumed 25 mL/d of either polyphenol-poor or polyphenol-rich raw olive oil for 3-week periods.
• Intervention periods were separated by 2-week washout periods.

Main Results:

• Polyphenol-rich olive oil significantly enhanced HDL cholesterol efflux capacity compared to polyphenol-poor olive oil (+3.05% vs. -2.34%).
• Increased incorporation of olive oil polyphenol metabolites into HDL was observed.
• Higher levels of large HDL (HDL2) and increased HDL fluidity were noted, alongside a decrease in small HDL (HDL3) and a more triglyceride-poor HDL core.

Conclusions:

• Olive oil polyphenols actively promote the antiatherogenic function of HDL by enhancing cholesterol efflux.
• Polyphenol-rich olive oil consumption leads to larger, more stable HDL particles with improved oxidative status.
• This study provides robust evidence for the enhancement of HDL function by polyphenol-rich olive oil.