Olive oil, particularly extra virgin olive oil, can help lower triglycerides, but it works best as part of an overall dietary pattern rather than as a standalone fix. Clinical trials show that a Mediterranean-style diet supplemented with virgin olive oil reduces both total and VLDL triglyceride concentrations within three months. The benefits come from two things working together: the monounsaturated fat replacing less healthy fats in your diet, and the natural plant compounds found in high-quality olive oil.
How Olive Oil Lowers Triglycerides
Your liver is the main factory for producing triglycerides. It assembles them from fatty acids and packages them into particles that travel through your bloodstream. Extra virgin olive oil contains compounds, primarily hydroxytyrosol, tyrosol, and oleuropein, that slow down this production process. Lab research published in The Journal of Nutritional Biochemistry found these compounds reduce the activity of key enzymes your liver uses to build both fatty acids and triglycerides. The effects were measurable within just two hours of exposure, with the enzyme responsible for the first step in fatty acid production dropping by 38 to 41%.
These compounds also activate your body’s internal energy sensor (a protein called AMPK), which essentially tells your liver cells to stop building fat and start burning it instead. This dual action, slowing fat production while encouraging fat breakdown, is what gives extra virgin olive oil its edge over refined oils that contain the same monounsaturated fat but lack these plant compounds.
What the Clinical Trials Show
The largest and most well-known trial is PREDIMED, which enrolled hundreds of people at high cardiovascular risk and assigned them to either a Mediterranean diet supplemented with virgin olive oil, a Mediterranean diet with nuts, or a low-fat control diet. After three months, both Mediterranean diet groups showed significant reductions in serum triglyceride concentrations compared to the low-fat group. They also saw improvements in HDL (good) cholesterol and blood pressure.
A key finding from the broader research, though, is that olive oil’s triglyceride-lowering effect is largely driven by the overall dietary pattern it’s part of. A network meta-analysis published in Frontiers in Nutrition found that the Mediterranean diet itself is the main driver for improvements in triglycerides, total cholesterol, and LDL cholesterol. Olive oil contributes, but it amplifies its benefits when paired with vegetables, fish, legumes, and whole grains rather than being simply drizzled on top of an otherwise unchanged diet.
How Much You Need
Most clinical studies used a daily dose of about 25 milliliters, roughly two tablespoons. Some trials went higher, using 40 to 50 milliliters (about three to four tablespoons), and a few used as much as 68 to 70 grams per day. The European Food Safety Authority approved health claims for olive oil’s benefits on blood lipids and oxidative protection at a daily intake of 20 grams of extra virgin olive oil, which is just under two tablespoons.
In one study of older adults, a supplement of two tablespoons daily for six weeks, consumed as part of their normal diet without increasing total calorie intake, led to improved lipoprotein profiles. That six-week mark is a reasonable minimum timeline to expect before you’d see changes on a blood test, though the PREDIMED results were measured at three months.
Extra Virgin vs. Refined Olive Oil
Not all olive oil is equal here. The triglyceride-lowering plant compounds, hydroxytyrosol, tyrosol, and oleuropein, are found in meaningful amounts only in extra virgin olive oil. Refined olive oil (often just labeled “olive oil” or “light olive oil”) has been processed in ways that strip out most of these compounds. You still get the monounsaturated fat, which is better for your heart than saturated fat, but you lose the specific mechanisms that directly reduce triglyceride production in the liver.
Research comparing virgin olive oil to high-oleic sunflower oil (which has a similar monounsaturated fat profile but different minor compounds) found that the minor components unique to olive oil influenced how the liver handled fat-carrying particles after a meal. The unsaponifiable fraction, the part of olive oil that isn’t just fat, modulates how your liver processes and releases triglyceride-rich lipoproteins.
The Calorie Trade-Off
Olive oil is still oil. One tablespoon contains about 120 calories, and if you’re adding two to four tablespoons a day on top of what you already eat, you could easily add 250 to 500 extra calories. Weight gain raises triglycerides, which would cancel out the benefits. A systematic review in BMC Nutrition flagged this as a significant limitation in the research: many studies didn’t control for total energy intake, making it hard to separate the oil’s direct effects from changes in overall diet composition.
The practical move is replacement, not addition. Use olive oil where you’d otherwise use butter, margarine, or other cooking fats. Dress salads with it instead of creamy dressings. Cook with it instead of vegetable oil. This way you get the benefits without the caloric surplus.
Cooking With Extra Virgin Olive Oil
A common concern is that cooking destroys the beneficial compounds. Research from the UC Davis Olive Center confirms that good quality extra virgin olive oil handles heat well. Its natural antioxidants are resistant to cooking temperatures and help prevent the formation of harmful compounds. The healthy phenols and monounsaturated fats also transfer into the food you’re cooking, so sautéing vegetables in extra virgin olive oil is a perfectly effective way to get the benefits.
Where Olive Oil Fits in Triglyceride Management
If your triglycerides are mildly elevated (150 to 199 mg/dL), dietary changes centered on a Mediterranean-style pattern with extra virgin olive oil can make a meaningful difference. For moderate elevations (200 to 499 mg/dL), olive oil is a helpful part of the strategy but probably not sufficient on its own. Reducing sugar, refined carbohydrates, and alcohol tends to have a larger individual impact on triglycerides than any single fat source.
For severe hypertriglyceridemia (500 mg/dL and above), the AHA’s primary dietary recommendation focuses on prescription-strength omega-3 fatty acids (EPA and DHA) at 4 grams per day, which can reduce triglycerides by 35 to 39%. Olive oil isn’t in the same league at that level of severity, though it remains a smart fat choice regardless.
The bottom line is that switching to extra virgin olive oil as your primary cooking and dressing fat is one of the more straightforward dietary changes you can make for your triglycerides. It works through real biological mechanisms, and the evidence supports it. Just treat it as a swap for less healthy fats rather than a supplement you pour on top of everything, and pair it with a broader dietary pattern that limits the refined carbs and sugars that drive triglyceride production from the other direction.