Insulin resistance occurs when the body’s cells become less responsive to insulin, the hormone that helps move glucose from the bloodstream into cells for energy. In response, the pancreas produces more insulin to help keep blood sugar levels under control. Over time, insulin resistance can increase the risk of developing type 2 diabetes and is associated with other metabolic health concerns.
Olive oil—particularly extra virgin olive oil (EVOO)—has long been studied as part of dietary patterns associated with better metabolic and cardiovascular health. Researchers continue to investigate exactly how the components of olive oil may influence the biological processes involved in insulin sensitivity.
A study published in Nutrients, “Impact of Olive Oil Components on the Expression of Genes Related to Type 2 Diabetes Mellitus,” offers another piece of that puzzle. The research examined how components naturally found in olive oil may influence the expression of genes involved in glucose and lipid metabolism.
How Olive Oil May Support Insulin Sensitivity
Olive oil contains primarily monounsaturated fat, along with a variety of naturally occurring plant compounds. Extra virgin olive oil is particularly valued because minimal processing helps preserve many of its phenolic compounds.
Researchers are interested in several components of olive oil and the roles they may play in metabolic health.
Oleic Acid
Oleic acid is the primary monounsaturated fatty acid found in olive oil. Research suggests that diets rich in monounsaturated fats may support healthy glucose metabolism and insulin sensitivity.
Oleic acid is present in all grades of olive oil, although the overall composition and concentration of beneficial minor compounds can differ depending on the quality and processing of the oil.
Polyphenols
Extra virgin olive oil also contains naturally occurring polyphenols, including compounds such as hydroxytyrosol and oleuropein derivatives.
These compounds have antioxidant and anti-inflammatory properties and are one reason EVOO continues to receive considerable scientific attention. Because chronic inflammation and oxidative stress are associated with insulin resistance, researchers are studying whether olive oil polyphenols may help support some of the cellular processes involved in healthy insulin function.
Higher-quality extra virgin olive oils can contain substantially more phenolic compounds than highly refined olive oils.
Gene Expression and Metabolism
One of the particularly interesting areas explored in the research is gene expression.
Our genes themselves are not being changed by eating olive oil. Instead, nutrients and other compounds in foods can influence whether certain genes become more or less active.
The study examined how components of olive oil may affect the expression of genes involved in processes such as glucose metabolism, lipid metabolism, inflammation and insulin signaling.
This may help researchers better understand why olive oil-rich dietary patterns have repeatedly been associated with favorable metabolic outcomes.
Olive Oil as Part of a Healthy Dietary Pattern
This research adds to a much larger body of evidence surrounding olive oil and the Mediterranean diet.
Rather than viewing olive oil as a treatment for insulin resistance or diabetes, it is more useful to consider it as part of an overall dietary pattern. Replacing less beneficial fats with high-quality olive oil can provide monounsaturated fats along with the naturally occurring compounds found in extra virgin olive oil.
And incorporating EVOO into everyday meals doesn't have to be complicated.
Use it to sauté or roast vegetables, drizzle it over salads and cooked foods, whisk it into dressings and marinades, or simply pair it with herbs and spices for dipping.
The Takeaway
Scientists have known for years that diets featuring olive oil are associated with important metabolic health benefits. Research into gene expression is now helping scientists investigate why those benefits may occur at the cellular level.
The emerging picture is fascinating: the fatty acids and naturally occurring polyphenols in olive oil may interact with biological pathways involved in inflammation, glucose metabolism, fat metabolism and insulin signaling.
It is another reason quality matters—and another reason extra virgin olive oil continues to be one of the most extensively studied foods at the heart of the Mediterranean diet.
Research Source:
Impact of Olive Oil Components on the Expression of Genes Related to Type 2 Diabetes Mellitus, Nutrients, 2025, 17(3), 570.
This article is for educational purposes only and is not intended to diagnose, treat, cure or prevent any disease or replace individualized medical advice.
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