Extra Virgin Olive Oil Linked to Better Memory and Gut Health in Two-Year Study

A two-year study has found that extra virgin olive oil does more than protect the heart. People who consumed it regularly showed better cognitive performance and a more diverse gut microbiome than those who used refined olive oil.

The research tracked participants over 24 months, measuring cognitive test scores and gut bacteria composition at regular intervals. Those in the extra virgin olive oil group consistently outperformed the refined oil group on memory and processing tasks.

Researchers identified specific microbial patterns in the gut that appeared to drive the cognitive benefits. The gut-brain connection, sometimes called the gut-brain axis, has become an active area of research in recent years. This study adds to the evidence that what happens in the digestive system can directly affect brain function.

Extra virgin olive oil is cold-pressed and retains more of the olive's natural compounds, including polyphenols, which have anti-inflammatory properties. Refined olive oil is processed at higher temperatures, which strips away many of these compounds.

The study's authors said the findings support choosing high-quality olive oil over refined versions, not just for cardiovascular health but for cognitive protection as well.

The research adds to a growing body of evidence linking diet to brain health. Earlier studies have connected the Mediterranean diet, which features olive oil prominently, to lower rates of cognitive decline and dementia.

Nutritionists say the practical takeaway is straightforward: use extra virgin olive oil for cooking and salads when possible. The cost difference between extra virgin and refined olive oil is modest, and the potential health benefits appear significant.

The study was published in a peer-reviewed nutrition journal and has been cited in multiple health news outlets.