Olive Oil and Cognitive Health: Modern Research Highlights the Benefits of Virgin Varieties

Emerging research suggests a strong link between olive oil consumption, gut health, and cognitive function, particularly emphasizing the benefits of virgin olive oil over refined versions. A recent study published in Microbiome found that higher consumption of virgin olive oil was associated with improved cognitive performance and a more diverse gut microbiota in older adults, while common olive oil showed the opposite effect.¹ This reinforces the importance of dietary fat quality in preserving brain health as we age.

The Gut-Brain Connection and Olive Oil

The relationship between diet and cognitive health is increasingly understood through the lens of the gut-brain axis – the bidirectional communication network between the gastrointestinal tract and the brain. The gut microbiota, the community of microorganisms residing in the digestive system, plays a crucial role in this communication. Changes in gut microbial composition can influence brain function and contribute to neurodegenerative diseases.²

Researchers at the Universitat Rovira I Virgili followed over 650 adults aged 55 to 75 who were overweight or obese and at risk of cognitive decline, but cognitively healthy at the study’s outset. Over two years, they tracked participants’ olive oil intake, gut microbiota profiles, and cognitive performance.¹

Virgin Olive Oil: A Cognitive Protector

The study revealed that higher consumption of virgin olive oil was associated with improvements or preservation in global cognition, executive function, and language skills. Participants consuming more virgin olive oil exhibited a more diverse gut microbiota and distinct microbial community structures. Specific gut bacteria, such as Adlercreutzia, appeared to mediate the link between virgin olive oil intake and improved cognitive performance.¹

These findings align with previous research indicating the neuroprotective properties of olive oil, attributed to its rich content of phenolic compounds with anti-inflammatory and antioxidant properties.³ The Mediterranean diet, of which olive oil is a cornerstone, has been consistently linked to better cognitive outcomes.

Refined Olive Oil: Potential Detrimental Effects

In contrast to virgin olive oil, higher intake of common, refined olive oil was linked to reduced microbial diversity in the gut and faster cognitive decline. This suggests that the processing methods used to create refined olive oil may diminish its health benefits and potentially contribute to negative outcomes.¹

Implications for Brain Health

“At a time when cases of cognitive decline and dementia are on the rise, our findings drive home the importance of improving diet quality, and in particular prioritizing extra virgin olive oil over other refined versions as an effective, simple and accessible strategy for protecting brain health,” said Universitat Rovira I Virgili researchers Nancy Babio and Stephanie Nishi.¹

Experts emphasize that the quality of fat consumed is as important as the quantity. Extra virgin olive oil not only protects cardiovascular health but also appears to preserve brain function during aging.¹ The role of the gut microbiota in these benefits opens avenues for new nutrition-based strategies to maintain cognitive function.

Key Takeaways

• Virgin olive oil consumption is associated with improved cognitive function and a more diverse gut microbiota.
• Refined olive oil may be linked to reduced microbial diversity and faster cognitive decline.
• The gut-brain axis plays a crucial role in the relationship between diet and cognitive health.
• Prioritizing high-quality fats, like extra virgin olive oil, is a simple and accessible strategy for protecting brain health.

Further research is needed to fully elucidate the mechanisms underlying these effects and to determine the optimal amount of olive oil for cognitive benefits. Although, the current evidence strongly supports incorporating virgin olive oil as a key component of a brain-healthy diet.

1. Ni, J., et al. (2026). Total and different types of olive oil consumption, gut microbiota, and cognitive function changes in older adults. Microbiome, 14(1), 68. https://doi.org/10.1186/s40168-025-02306-4
2. The effects of olive oil consumption on cognitive performance: a systematic review
3. Effect of extra virgin olive oil on mild cognitive impairment and dementia in older adults: a systematic review and meta-analysis of clinical trials