Extra virgin olive oil contains numerous naturally occurring compounds that scientists continue to investigate for their potential biological effects.
One of them is tyrosol, a phenolic compound found in EVOO.
Researchers from the University of Jaén and Bellvitge Biomedical Research Institute investigated whether tyrosol could influence processes associated with Parkinson's disease.
Their findings were promising: tyrosol reduced oxidative stress, delayed neurodegeneration and increased lifespan in their experimental model.
But there's an important detail:
The study was conducted in worms—not humans.
Why Study Tyrosol?
Tyrosol is one of the naturally occurring phenolic compounds associated with olives and olive oil.
Researchers are interested in these compounds because of their antioxidant properties and their potential effects on oxidative stress and inflammation.
Oxidative stress is particularly interesting in neurological research because it can damage cells and has been implicated in the processes associated with several neurodegenerative diseases.
Researchers wanted to determine whether tyrosol might protect against some of those processes in an experimental model of Parkinson's disease.
How Was the Study Conducted?
The researchers used Caenorhabditis elegans, a tiny roundworm commonly used in biological research.
Why worms?
Despite their simplicity, C. elegans share many genes and biological pathways with humans. Their short lifespan also allows scientists to observe aging and neurodegenerative processes relatively quickly.
Researchers used worms exhibiting different models of Parkinsonism and treated some of them with tyrosol.
They then compared the treated worms with untreated worms.
Tyrosol Delayed Neurodegeneration
One of the most interesting findings involved dopaminergic neurons.
These are the neurons responsible for producing dopamine, and their progressive loss is one of the defining characteristics of Parkinson's disease.
At two weeks of age, approximately 80% of the dopaminergic neurons remained intact in the tyrosol-treated worms, compared with approximately 45% in untreated worms.
Researchers concluded that tyrosol appeared to delay neurodegeneration in the experimental model.
Researchers Also Observed Less Oxidative Stress
Tyrosol treatment was associated with a substantial reduction in markers of oxidative damage.
Researchers also observed increased expression of certain protective proteins, including heat-shock proteins that help cells respond to stress and protect themselves from damage.
Together, these findings suggested that tyrosol produced an antioxidant and cellular-protective effect in the worms.
What About Alpha-Synuclein?
Another important finding involved alpha-synuclein.
Alpha-synuclein is a protein that can accumulate abnormally in the brain in Parkinson's disease.
Researchers observed significantly fewer alpha-synuclein aggregates in worms treated with tyrosol than in untreated worms.
That doesn't mean tyrosol has been shown to prevent these accumulations in the human brain.
But it provides another reason researchers are interested in investigating the compound further.
The Worms Also Lived Longer
Researchers found another notable difference.
Tyrosol-treated worms lived an average of approximately 21.3 days, compared with approximately 18.7 days for untreated worms.
Previous work by the research team had also suggested that tyrosol could influence aging, lifespan and cellular-stress markers in C. elegans.
Those earlier findings helped lead researchers to investigate whether the compound might also influence processes associated with neurodegenerative disease.
Does This Mean EVOO Prevents or Treats Parkinson's Disease?
No.
This is the most important limitation of the study.
Researchers weren't giving EVOO to people with Parkinson's disease.
They were studying an individual phenolic compound found in olive oil using a laboratory model involving worms.
Results in C. elegans are useful for identifying biological mechanisms worth investigating, but they cannot tell us whether the same effects will occur in humans.
Additional laboratory research, animal studies and ultimately human clinical research would be necessary before conclusions could be made about tyrosol's usefulness in preventing or treating Parkinson's disease.
Why Does This Research Matter?
Because studies like this help scientists understand how individual compounds found naturally in extra virgin olive oil interact with biological systems.
When we talk about EVOO's biophenol content, we're actually talking about a family of individual phenolic compounds—not one single substance.
Tyrosol is one of those compounds.
Others include hydroxytyrosol and compounds derived from oleuropein and ligstroside.
Each has its own chemistry and potential biological activity, which researchers continue to investigate.
That's one reason a Biophenol value is such an interesting part of an EVOO's chemistry profile. It tells us something about the presence of this broader group of naturally occurring compounds, while individual studies help scientists understand what particular compounds may actually do.
The Takeaway
Researchers found that tyrosol reduced oxidative stress, delayed neurodegeneration, influenced protective genes and increased lifespan in a worm model of Parkinson's disease.
They also observed greater preservation of dopamine-producing neurons and fewer accumulations of alpha-synuclein.
Those are fascinating results.
But they are early-stage laboratory findings, not evidence that consuming extra virgin olive oil prevents or treats Parkinson's disease in humans.
What the study does demonstrate is why researchers remain so interested in the individual phenolic compounds naturally present in EVOO.
Tyrosol is one small part of extra virgin olive oil's complex chemistry—and scientists are still learning what these compounds may be capable of.
Research Source
Cañuelo A, Gilbert-López B, Pacheco-Liñán P, et al. Tyrosol, a main phenol present in extra virgin olive oil, increases lifespan and stress resistance in Caenorhabditis elegans. Research involving tyrosol and Parkinsonism models published in Neurobiology of Aging, 2019.
This article is for educational purposes only and is not intended to diagnose, treat, cure or prevent any disease or replace individualized medical advice.
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