Olive oil can increase HDL cholesterol, but the effect is modest and depends heavily on the type of olive oil you use. Across pooled clinical trials involving nearly 1,000 participants, olive oil polyphenols raised HDL by roughly 1 mg/dL on average. That’s a small number, but the more important story is what olive oil does to HDL quality, not just quantity.
How Much HDL Increase to Expect
A large dose-response meta-analysis of 33 randomized controlled trials found that every 10 grams per day of olive oil (a little over two teaspoons) produced a very small HDL increase of about 0.22 mg/dL. The greatest bump appeared at around 20 grams per day (roughly 1.5 tablespoons), where HDL rose by about 1 mg/dL. Neither result was statistically significant on its own, meaning the increase could partly be due to chance.
A separate meta-analysis focused specifically on olive oil polyphenols told a slightly more encouraging story. Pooling data from 991 subjects, it found a statistically significant HDL increase of 1.13 mg/dL across low, medium, and high polyphenol intake levels. So polyphenols appear to be the active ingredient driving whatever HDL bump olive oil provides.
For context, regular aerobic exercise typically raises HDL by 2 to 3 mg/dL, and moderate alcohol consumption raises it by about 4 mg/dL. Olive oil alone is not a powerful HDL-raising tool if you’re looking at the number on a blood test.
Why HDL Quality Matters More Than the Number
The real benefit of olive oil for HDL isn’t about raising the number. It’s about making your existing HDL work better. HDL particles act like garbage trucks for cholesterol, picking up excess cholesterol from artery walls and carrying it back to the liver for disposal. This cleanup process is called cholesterol efflux, and it’s the main reason HDL is considered “good” cholesterol.
In a 12-week trial published in the British Journal of Nutrition, extra-virgin olive oil consumption improved HDL’s ability to pull cholesterol out of immune cells in artery walls. The oil did this by increasing the production of two key transport proteins (ABCA1 and ABCG1) that act as loading docks, handing off cholesterol to HDL particles. Polyphenol extracts from extra-virgin olive oil boosted these transporters in a dose-dependent way: more polyphenols, more efficient cholesterol removal.
Olive oil also shifts the balance of HDL particle sizes in a favorable direction. A randomized crossover trial found that polyphenol-rich olive oil increased the proportion of large HDL particles while decreasing small ones. Large HDL particles (sometimes called HDL2) are considered the more protective subfraction, associated with lower cardiovascular risk. So even when total HDL numbers barely budge, the HDL you have becomes functionally better at its job.
Extra-Virgin vs. Refined Olive Oil
Not all olive oil is equal here. The polyphenols in extra-virgin olive oil are the compounds driving improvements in HDL function, and refined olive oil has most of those stripped away during processing.
In a study of 30 healthy men, three weeks of about two tablespoons daily of extra-virgin olive oil (with 150 mg/kg of polyphenols) raised HDL from 60.6 to 63.7 mg/dL. Olive oil with very low or undetectable polyphenol levels produced no change. A separate EUROLIVE study confirmed that while high-polyphenol olive oil didn’t always raise total HDL, it consistently improved HDL composition by increasing the protective HDL2 subfraction.
A randomized trial of 50 patients with high cholesterol tested this idea from another angle. Instead of comparing extra-virgin to refined, it compared a larger dose of lower-polyphenol extra-virgin olive oil against a smaller dose of higher-polyphenol oil, calibrated so both groups consumed the same total polyphenols per day. The higher-polyphenol group (using just 8 grams daily of a polyphenol-rich oil) showed more favorable cholesterol changes than the group consuming 20 grams of a lower-polyphenol oil. This supports the idea that polyphenol concentration matters more than how much oil you pour.
When shopping, look for extra-virgin olive oil with a harvest date, ideally less than a year old. Fresher oil retains more polyphenols. Oils that taste peppery or slightly bitter at the back of your throat tend to be higher in these protective compounds.
How Olive Oil Compares to Other Oils
Olive oil’s advantage over other cooking oils is not about raising HDL higher. A controlled feeding study comparing olive oil, rapeseed (canola) oil, and sunflower oil found no significant difference in total HDL among the three. Olive oil did produce slightly higher levels of the protective HDL2a subfraction compared to sunflower oil, but rapeseed and sunflower oil actually had more favorable effects on overall blood lipids and LDL particle profiles.
Where olive oil stands apart is in polyphenol content. Canola oil, sunflower oil, and other refined vegetable oils contain negligible polyphenols. The HDL quality improvements, including better cholesterol efflux and larger particle size, are unique to polyphenol-rich extra-virgin olive oil. Replacing butter or other saturated fats with olive oil also lowers LDL cholesterol, which is a more impactful change for heart health than any HDL shift.
How Long Before You See Changes
The clinical trials showing HDL improvements used relatively short timeframes. Measurable changes in HDL composition appeared within three weeks of daily consumption at about 25 mL (roughly two tablespoons) per day. The study showing improved cholesterol efflux capacity ran for 12 weeks. So if you’re adding extra-virgin olive oil to your diet and planning to recheck your lipids, give it at least a month, though three months is more realistic for the functional improvements.
Keep in mind that olive oil adds calories, about 120 per tablespoon. The goal is to replace other fats in your diet rather than adding oil on top of everything else. Use it for salad dressings, drizzle it over cooked vegetables, or use it in place of butter when sautéing. The 2025 Dietary Guidelines and the American College of Cardiology both recommend olive oil as a preferred fat source, with the broader advice to keep saturated fat below 10% of daily calories.
The Bottom Line on Olive Oil and HDL
If your goal is to significantly raise your HDL number, olive oil alone won’t get you there. The measured increase is roughly 1 mg/dL in the best-case scenario. But HDL isn’t just about the number on your lab report. Extra-virgin olive oil, specifically the polyphenols it contains, makes your HDL particles larger, more functional, and better at clearing cholesterol from your arteries. That functional improvement is arguably more valuable than a higher number, and it’s something refined oils and other fats simply don’t provide. Two tablespoons of good-quality extra-virgin olive oil per day, replacing less healthy fats rather than added on top, is the dose supported by clinical evidence.