Olive oil's relationship with cardiovascular health has been studied extensively, but researchers are also interested in how individual compounds within olive oil may affect the heart at a cellular and metabolic level.
One animal study published in Nutrition Journal investigated olive oil along with two of its minor phenolic compounds—oleuropein and caffeic acid—to determine how they affected oxidative stress, fat oxidation and energy metabolism in heart tissue.
The results offered some interesting clues, particularly under conditions of obesity.
Looking Inside the Heart
Researchers from São Paulo State University in Brazil studied both obese and non-obese rats.
They wanted to determine whether supplementation with olive oil, oleuropein or caffeic acid could influence the way cardiac tissue used energy and whether these substances affected oxidative stress.
After 42 days, the obese rats that received olive oil, oleuropein or caffeic acid showed increased oxygen consumption and fat oxidation compared with obese rats that didn't receive supplementation.
The researchers concluded that the treatments appeared to enhance fat oxidation and influence cardiac energy metabolism in the obese animals.
Why Fat Oxidation Matters
The heart requires a continuous supply of energy to function.
Fatty acids are one of its major energy sources, and researchers were interested in whether obesity-related changes in cardiac metabolism could be influenced by components of olive oil.
In the study, obesity was associated with lower energy expenditure, oxygen consumption and fat oxidation.
Supplementation with olive oil and the selected phenolic compounds appeared to modify some of those changes.
What About Antioxidant Activity?
Researchers also examined oxidative stress.
Interestingly, the results weren't identical between the obese and non-obese animals.
Antioxidant enzyme activity was not significantly changed by olive oil or the phenolic compounds in the obese rats. However, increased antioxidant enzyme activity was observed in some of the non-obese rats receiving olive oil or oleuropein.
This suggests that the effects of olive oil's compounds may vary depending upon metabolic conditions.
Oleuropein and Other Biophenols
Oleuropein is one of the naturally occurring phenolic compounds associated with olives and virgin olive oil.
It's part of the larger family of compounds we generally refer to at The Anointed Olive as Biophenols.
These compounds have attracted scientific interest because of their antioxidant and biological activity and are one reason researchers look beyond olive oil's fatty-acid composition when investigating EVOO.
An Important Limitation: This Was an Animal Study
This distinction matters.
The study was performed in rats, not people.
The researchers themselves noted that additional research would be needed to determine whether similar metabolic effects occur in humans and whether those changes translate into meaningful improvements in cardiac function.
So the study does not demonstrate that consuming olive oil will increase cardiac fat oxidation or treat obesity-related heart problems in people.
Instead, it helps researchers better understand potential mechanisms that may warrant further investigation.
The Takeaway
The study found that olive oil and two phenolic compounds associated with it—oleuropein and caffeic acid—affected fat oxidation and energy metabolism in the cardiac tissue of obese rats.
Researchers also observed antioxidant effects under some conditions.
While these findings can't be directly applied to humans, studies like this help scientists investigate why olive oil and its naturally occurring compounds continue to attract attention in cardiovascular research.
Research Source
Ebaid GMX, Seiva FRF, Rocha KKHR, Souza GA, Novelli ELB. Effects of olive oil and its minor phenolic constituents on obesity-induced cardiac metabolic changes. Nutrition Journal. 2010;9:46. DOI: 10.1186/1475-2891-9-46.
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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