Virgin Olive Oil and Cognitive Health: How Gut Microbiota Plays a Role
Virgin olive oil, a cornerstone of the Mediterranean diet, is well-known for its cardiovascular and metabolic benefits. Emerging research now suggests a surprising link between this dietary staple and cognitive function, mediated by the gut microbiota. A recent study sheds light on how the type of olive oil consumed—virgin versus refined—can significantly impact brain health through its influence on the composition of gut bacteria.
The Connection Between Olive Oil, Gut Microbiota and Cognition
Researchers at the Human Nutrition Unit of the Rovira i Virgili University, within the CIBEROBN framework, conducted a prospective study involving 656 individuals aged 55 to 75 with overweight or obesity and metabolic syndrome.1 The study, spanning two years, examined the relationship between olive oil consumption (virgin and refined), gut microbiota composition, and changes in cognitive function.
Virgin Olive Oil: A Boon for Brain Health
The findings revealed that individuals who consumed virgin olive oil exhibited better cognitive function and greater diversity in their gut microbiota compared to those who consumed refined olive oil.1 A diverse gut microbiota is a key indicator of intestinal and metabolic health. Conversely, refined olive oil consumption was associated with a decrease in gut microbiota diversity over time.
Notably, the study identified the genus Adlercreutzia as a potential indicator of the beneficial association between virgin olive oil consumption and preserved cognitive function.1 This suggests that the positive effects of virgin olive oil on brain function may be, in part, explained by its impact on the gut microbiota composition.
The Refining Process: What’s Lost?
The key difference between virgin and refined olive oil lies in the processing method. Virgin olive oil is obtained solely through mechanical procedures, preserving its natural composition. Refined olive oil, however, undergoes industrial treatments to remove impurities. Unfortunately, these processes also degrade beneficial compounds like natural antioxidants (polyphenols), vitamins, and other bioactive substances.1
Quality Matters: Prioritizing Virgin Olive Oil
Researchers emphasize that not all olive oils offer cognitive benefits, highlighting the importance of choosing virgin olive oil over refined options.1
Implications for Cardiovascular and Cognitive Health
These findings contribute to a growing understanding of the links between cardiovascular health, cognitive health, and the gut microbiota. Jordi Salas-Salvadó, the principal investigator of the study, underscores the importance of olive oil quality as a central element of the Mediterranean diet. He notes that virgin olive oil not only protects the heart but may also help preserve brain function during aging.1
Identifying a microbial profile involved in these benefits opens the door to new, nutrition-based strategies for preserving cognitive function.
The Mediterranean Diet and Cardiovascular Health
A Mediterranean diet rich in extra-virgin olive oil has been associated with a reduced prevalence of nonalcoholic fatty liver disease in older individuals at high cardiovascular risk.2 studies have shown that individuals following a Mediterranean diet with extra virgin olive oil or nuts have a lower incidence of cardiovascular disease and stroke.3