Scientists continue to uncover new health benefits associated with olive oil. One of the most intriguing recent discoveries is the relationship between olive oil quality and brain health[1].
According to a new study, extra virgin olive oil may support cognitive function in later life through its positive effects on the gut microbiome. While this connection may seem unexpected, a growing body of evidence suggests that the bacteria living in our digestive system can influence cognitive processes and overall brain health.
A healthy gut microbiome may therefore contribute not only to digestive wellness but also to a healthier mind.
What Did the Study Find?
Researchers followed 656 adults between the ages of 55 and 75 who were living with overweight, obesity, and metabolic syndrome. Metabolic syndrome is a cluster of conditions associated with an increased risk of cardiovascular disease and type 2 diabetes.
Over a two-year period, participants who regularly consumed extra virgin olive oil showed improvements in cognitive performance and greater diversity within their gut microbiome.
In contrast, participants who primarily consumed refined olive oil experienced a decline in microbial diversity. The researchers also identified a bacterial genus called Adlercreutzia as a potential marker associated with the positive effects observed in the extra virgin olive oil group.
Why Does Olive Oil Quality Matter?
The key difference lies in how the oil is produced.
Extra virgin olive oil is obtained solely through mechanical extraction methods. This process preserves naturally occurring bioactive compounds, including oleocanthal and oleuropein, both of which are known for their anti-inflammatory properties.
Refined olive oil, on the other hand, undergoes chemical processing to remove impurities and standardize flavor. While this improves shelf life and consistency, it also reduces the concentration of many beneficial compounds naturally present in olive oil.
As lead author Jiaqi Ni explains:
“Not all types of olive oil provide benefits for cognitive function. The quality of the fat we consume appears to be at least as important as the quantity.”
The Gut-Brain Axis: A New Explanation for Olive Oil’s Benefits
These findings align with previous research on the Mediterranean diet, which has long been associated with a lower risk of cardiovascular disease and healthy aging.
Scientists are increasingly focusing on the gut-brain axis, the complex communication network between the digestive system and the brain. A diverse and balanced gut microbiome may help reduce inflammation and influence various biological pathways that support brain function.
According to the researchers, extra virgin olive oil may therefore contribute to both cardiovascular and cognitive health during the aging process.
What Does This Mean for an Aging Population?
As populations continue to age worldwide, dementia and age-related cognitive decline are becoming increasingly common public health concerns.
The results of this study suggest that choosing extra virgin olive oil over refined alternatives could be a simple and accessible strategy to support long-term brain health, particularly for individuals with metabolic risk factors.
Although further research is needed, these findings reinforce the value of prioritizing minimally processed, nutrient-rich foods within a healthy diet.
Conclusion: Choose Quality Over Refinement
Your daily two tablespoons of olive oil may offer benefits far beyond flavor.
When you choose a high-quality extra virgin olive oil, you may be supporting not only heart health but also gut health and cognitive function. As preventive healthcare becomes increasingly important, this is a science-backed dietary choice that is easy to incorporate into everyday life.
Source
[1] Ni et al. (2026). Total and different types of olive oil consumption, gut microbiota, and cognitive function changes in older adults. Microbiome.
