A recent Spanish study reveals that extra virgin olive oil not only supports heart health but may also help protect brain health and boost cognitive functions with aging. The study, from Rovira i Virgili University and reported by Fox News, shows a link between consuming this type of olive oil and increased gut bacteria diversity, a factor that may play a key role in supporting memory, attention, and maintaining mental abilities in older adults. The research indicates that individuals who used extra virgin olive oil, instead of refined oil, showed improved cognitive functions along with greater gut bacteria diversity, which researchers consider a crucial sign of digestive and metabolic health. Lead researcher Giacomo Neri stated this is the first prospective human study to specifically analyze olive oil's role in the gut microbiome-cognition interaction. The study, spanning two years, included over 600 people aged 55-75 with overweight, obesity, or metabolic syndrome, all risk factors for heart disease. Researchers tracked participants' consumption of both olive oil types and analyzed their gut microbiomes. The results suggest that higher levels of beneficial gut bacteria may explain the cognitive improvements seen in extra virgin olive oil consumers. However, the study relied on self-reported dietary data, which can be less accurate. In contrast, those who consumed refined oil showed a decrease in gut bacteria diversity over time. The key difference between the oils lies in processing; refined oil undergoes industrial treatments that strip away most antioxidants and natural vitamins. A subsequent cognitive assessment found that extra virgin olive oil users experienced improvements in memory, attention, and executive functions within two years, benefits not seen in the refined oil group. Researchers also identified a specific bacterium, 'Akkermansia,' as a potential brain health marker, with higher levels found in extra virgin olive oil consumers. The scientists emphasized that the findings reinforce the idea that the quality of fats consumed is as important as the quantity, and that extra virgin olive oil may not only protect the heart but also help preserve brain function with age. They also noted the study's limitations, including its observational nature and focus on a specific group of older adults in the Mediterranean with certain health risks, which may limit the generalizability of the results.
