Olive oil does not meaningfully raise LDL cholesterol when added to your diet. A large meta-analysis pooling 31 randomized trials found that increasing olive oil intake produced essentially no change in LDL levels, even at higher doses. But the full picture is more interesting than that flat result suggests, because what olive oil does to your LDL depends heavily on what fat it replaces, what grade of oil you use, and whether you care only about the LDL number or also about what your LDL particles are actually doing in your bloodstream.
What the Pooled Trial Data Show
The most comprehensive look at olive oil and LDL comes from a dose-response meta-analysis that combined 31 randomized controlled trials involving over 1,500 participants. Researchers found that each additional 10 grams per day of olive oil (roughly two teaspoons) changed LDL cholesterol by a negligible amount, and the relationship stayed flat across a wide range of intakes. In statistical terms, there was no meaningful dose-response curve at all.1British Journal of Nutrition. The effects of olive oil consumption on blood lipids: a systematic review and dose–response meta-analysis of randomised controlled trials – Section: Results That means whether you drizzle a tablespoon on your salad or cook liberally with a quarter cup, your LDL is unlikely to budge much in either direction from the olive oil itself.
A separate meta-analysis of 27 placebo-controlled trials largely agreed but added an important wrinkle: olive oil did lower LDL compared to control diets, but it lowered LDL less effectively than other plant oils. The gap was roughly 4 mg/dL, meaning if you switched from, say, soybean oil or flaxseed oil to olive oil, you might see a small upward drift in LDL, not because olive oil raised it in absolute terms but because the alternative was doing a better job of pulling it down.2PubMed. Comparison of blood lipid-lowering effects of olive oil and other plant oils: A systematic review and meta-analysis of 27 randomized placebo-controlled clinical trials
The Comparison Trap
Most confusion about olive oil and LDL comes from a simple issue: the answer changes depending on what fat you are comparing it to. Olive oil looks great next to butter and mediocre next to certain seed oils. Neither comparison tells the whole story, but both show up in headlines.
A randomized trial that pitted olive oil against butter and coconut oil found that butter raised LDL substantially compared to olive oil, while coconut oil and olive oil produced statistically identical LDL levels.3PubMed Central. Randomised trial of coconut oil, olive oil or butter on blood lipids and other cardiovascular risk factors in healthy men and women – Section: Results If your baseline is a diet heavy in butter, cream, and fatty meat, swapping in olive oil will almost certainly lower your LDL. But if your baseline already uses rapeseed (canola), sunflower, or soybean oil, switching to olive oil could nudge LDL upward. One head-to-head trial found that LDL cholesterol concentrations ran about 10 to 20 percent higher on an olive oil diet compared to rapeseed oil or sunflower oil diets.4Journal of Lipid Research. An olive oil-rich diet results in higher concentrations of LDL cholesterol and a higher number of LDL subfraction particles than rapeseed oil and sunflower oil diets
A network meta-analysis that systematically ranked different fats confirmed this pattern: oils rich in omega-3 and omega-6 fats were more effective at reducing LDL and total cholesterol than olive oil, while palm oil pushed LDL considerably higher than vegetable oils low in saturated fat.5PubMed Central. Effects of oils and solid fats on blood lipids: a systematic review and network meta-analysis – Section: Results Olive oil sits comfortably in the middle of the fat spectrum: better than animal fats and tropical oils, not quite as potent as the most polyunsaturated plant oils for raw LDL-lowering.
Why the Fat You Replace Matters at the Cellular Level
The reason different fats shift LDL in different directions comes down to how your liver handles cholesterol clearance. Your liver has receptors that pull LDL particles out of your bloodstream. The type of fatty acid arriving in your diet influences how many of those receptors the liver makes and how actively they work. Oleic acid, the dominant fat in olive oil, supports this receptor activity and helps prevent the receptor suppression that saturated fats cause.6Biochimica et Biophysica Acta (BBA) – Lipids and Lipid Metabolism. Opposite effects on cholesterol metabolism and their mechanisms induced by dietary oleic acid and palmitic acid in hamsters At the molecular level, oleic acid promotes an enzyme inside cells that packages free cholesterol away, signaling the cell to ramp up its LDL receptors and pull more LDL from circulation.7Journal of Biological Chemistry. Oleate and Other Long Chain Fatty Acids Stimulate Low Density Lipoprotein Receptor Activity by Enhancing Acyl Coenzyme A:Cholesterol Acyltransferase Activity and Altering Intracellular Regulatory Cholesterol Pools in Cultured Cells Different dietary fats shift receptor protein and messenger RNA levels in parallel, which is why the effects on blood LDL can be fairly predictable based on the fatty acid profile of what you eat.8PubMed Central. Dietary fatty acids regulate hepatic low density lipoprotein (LDL) transport by altering LDL receptor protein and mRNA levels
A 2024 randomized trial put this to a direct test by substituting olive oil for lard in people with insulin resistance and abnormal lipids. The swap cut LDL cholesterol by about 7 percent and reduced the total number of LDL particles in circulation, partly by speeding up the rate at which the liver broke down those particles.9The American Journal of Clinical Nutrition. Substitution of dietary monounsaturated fatty acids from olive oil for saturated fatty acids from lard increases low-density lipoprotein apolipoprotein B-100 fractional catabolic rate in subjects with dyslipidemia associated with insulin resistance: a randomized controlled trial – Section: Results So when olive oil replaces saturated fat specifically, the LDL-lowering effect is real and measurable.
Why Rapeseed and Sunflower Oils Pull Ahead
If oleic acid supports LDL receptor activity, why do some other plant oils still outperform olive oil? Part of the answer involves cholesterol absorption in the gut. Rapeseed oil naturally contains higher concentrations of plant sterols, which are compounds that compete with cholesterol for absorption. An ileostomy study (using patients whose gut contents could be directly measured) found that rapeseed oil decreased cholesterol absorption, increased the excretion of both cholesterol and bile acids, and lowered blood cholesterol levels compared to olive oil, differences that were partly explained by the different concentrations of naturally occurring plant sterols.10PubMed. Rapeseed oil, olive oil, plant sterols, and cholesterol metabolism: an ileostomy study – Section: CONCLUSIONS Plant sterols work by blocking cholesterol uptake in the intestinal wall and pumping some of it back into the gut before it ever reaches the bloodstream.11PubMed. Role of naturally-occurring plant sterols on intestinal cholesterol absorption and plasmatic levels
Polyunsaturated fats in these oils also have a somewhat stronger effect on liver LDL receptor activity than monounsaturated oleic acid does. The combined result is a modest but consistent edge in LDL reduction for omega-3-rich and omega-6-rich oils over olive oil.
Not All Olive Oil Works the Same Way
One detail that rarely makes it into the “olive oil and cholesterol” conversation is how much the grade of oil matters. Extra-virgin olive oil (EVOO) is mechanically pressed and retains its full load of polyphenols, tocopherols, and other minor compounds. Refined olive oil has been chemically processed, stripping out most of those bioactives while keeping the same fatty acid profile. A network meta-analysis comparing different olive oil types found that high-polyphenol EVOO slightly reduced LDL cholesterol compared to low-polyphenol EVOO, with a mean difference of about 0.14 mmol/L.12Nutrition, Metabolism and Cardiovascular Diseases. Impact of different types of olive oil on cardiovascular risk factors: A systematic review and network meta-analysis Refined olive oil showed no such advantage.
That gap is small in absolute terms, but it points to something important: the polyphenols in good EVOO are doing work beyond what the fat itself can do. A crossover trial in men found that olive oil rich in polyphenols actually lowered LDL concentrations compared to polyphenol-poor olive oil, and it also made LDL particles more resistant to oxidation.13PubMed Central. Olive Oil Polyphenols Decrease LDL Concentrations and LDL Atherogenicity in Men in a Randomized Controlled Trial – Section: Results This distinction between EVOO and refined oil helps explain some of the mixed results in the literature. Trials that used refined olive oil or generic “olive oil” without specifying grade may have missed the polyphenol effect entirely.
Oxidized LDL and Why the Number Alone Is Misleading
Focusing only on how much LDL is in your blood misses a piece of the puzzle that cardiologists increasingly care about: what condition those LDL particles are in. LDL becomes dangerous primarily when it gets oxidized, a chemical change that makes it more likely to embed in artery walls and trigger inflammation. Olive oil polyphenols directly protect LDL from oxidation.
A human trial found that consuming polyphenol-rich olive oil reduced systemic LDL oxidation and dialed down the expression of genes involved in inflammatory and artery-clogging processes, including a key inflammatory signal called CD40 ligand.14The American Journal of Clinical Nutrition. Protection of LDL from oxidation by olive oil polyphenols is associated with a downregulation of CD40-ligand expression and its downstream products in vivo in humans A study in men with peripheral vascular disease compared EVOO to refined olive oil and found that EVOO made LDL significantly more resistant to copper-induced oxidation and reduced the amount of LDL taken up by immune cells called macrophages, a step that normally accelerates plaque formation.15The Journal of Nutrition. Extra-Virgin Olive Oil Increases the Resistance of LDL to Oxidation More than Refined Olive Oil in Free-Living Men with Peripheral Vascular Disease
This matters because two people can have identical LDL numbers yet very different cardiovascular risk profiles depending on how much of their LDL is oxidized. Olive oil, especially high-quality EVOO, may leave the LDL number roughly unchanged while making the particles themselves less harmful.
What Olive Oil Does to HDL
LDL gets most of the attention, but olive oil’s most interesting lipid effects may actually be on HDL. HDL particles work by ferrying excess cholesterol away from arteries back to the liver. But not all HDL works equally well. Research shows that olive oil polyphenols improve the functional quality of HDL, not just its quantity. In a randomized controlled trial, polyphenol-rich olive oil increased HDL’s ability to remove cholesterol from cells by about 3 percent more than polyphenol-poor olive oil did, while also shifting the HDL particle profile toward larger, more effective particles.16PubMed. Olive oil polyphenols enhance high-density lipoprotein function in humans: a randomized controlled trial
A separate study found that 12 weeks of EVOO consumption boosted HDL’s cholesterol-removal capacity by roughly 12 percent overall, with certain HDL subclasses improving even more dramatically through specific transport pathways.17British Journal of Nutrition. Extra-virgin olive oil consumption improves the capacity of HDL to mediate cholesterol efflux and increases ABCA1 and ABCG1 expression in human macrophages – Section: Results A crossover trial (the OLIVAUS study) found that both high-polyphenol and low-polyphenol olive oils raised HDL cholesterol, though there was also a small but statistically significant increase in LDL after the high-polyphenol oil intervention.18PubMed Central. Extra virgin olive oil improves HDL lipid fraction but not HDL-mediated cholesterol efflux capacity: a double-blind, randomised, controlled, cross-over study (OLIVAUS) – Section: Results That last finding is a reminder that small LDL bumps can show up in individual trials even when the overall meta-analytic picture is neutral. The clinical question is whether that minor uptick matters when HDL function is simultaneously improving.
Heart Outcomes Tell a Different Story Than LDL Alone
If olive oil’s effect on raw LDL numbers is modest at best, how did it earn its reputation as a heart-healthy fat? Because cardiovascular events, the outcomes that actually determine whether people get sick or die, tell a much more favorable story. The PREDIMED trial, one of the largest and most influential diet studies ever conducted, randomly assigned thousands of people at high cardiovascular risk to either a Mediterranean diet supplemented with about a liter per week of EVOO, a Mediterranean diet supplemented with nuts, or a control diet. The group given EVOO had roughly 31 percent fewer major cardiovascular events (heart attacks, strokes, and cardiovascular death) compared to controls.19PubMed. Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts – Section: RESULTS
That benefit was not driven by dramatic LDL reductions. It likely reflects the combined effects of reduced LDL oxidation, improved HDL function, lower blood pressure, reduced inflammation, and better handling of the fat spike that happens in your blood after meals. A small study found that minor components in olive oil helped clear triglyceride-rich particles from the blood faster after eating, which reduces the time those potentially harmful particles spend in contact with artery walls.20Nutrition Research. Minor components of olive oil facilitate the triglyceride clearance from postprandial lipoproteins in a polarity-dependent manner in healthy men The cardiovascular protection from EVOO appears to work through several parallel channels, with LDL concentration being only one piece and not the most important one.
Squalene and Other Minor Compounds
Olive oil contains more squalene than almost any other common food oil. Squalene is a natural compound that your body can convert into cholesterol, which sounds like it should raise LDL. And it can, in theory: squalene is at least partially absorbed from the diet and then converted into cholesterol in the body.21Nutrition Reviews. Effects of Trace Components of Dietary Fat on Cholesterol Metabolism: Phytosterols, Oxysterols, and Squalene But in animal studies, squalene supplementation at realistic doses actually raised HDL cholesterol and reduced oxidative stress in lipoproteins without raising LDL.22PubMed Central. Dietary squalene increases high density lipoprotein-cholesterol and paraoxonase 1 and decreases oxidative stress in mice The amounts found in a normal olive oil-rich diet are small enough that any theoretical cholesterol-raising effect from squalene conversion appears to be offset by its antioxidant properties.
Cooking With Olive Oil and Lipid Effects
There is a persistent concern that heating olive oil destroys its benefits or creates harmful compounds that could worsen your lipid profile. The evidence is more reassuring than the worry suggests. Olive oil has a higher smoke point than many people assume, and its polyphenols and monounsaturated fat structure make it more stable under heat than polyunsaturated oils. A study comparing meals rich in heated versus unheated oils found that heated olive oil did reduce the lag time before lipoproteins started oxidizing in the blood after eating, but the effect was similar in magnitude to heated safflower oil and still less pronounced than eating unheated oils high in polyunsaturated fats.23Atherosclerosis. Effect of meals rich in heated olive and safflower oils on oxidation of postprandial serum in healthy men Meals rich in native (unheated) olive oil did not increase postprandial oxidation susceptibility at all. The practical takeaway: using EVOO for moderate-heat cooking is fine, but if you want the full antioxidant benefit, use it raw as a finishing oil when you can.
Individual Variation and When LDL Might Actually Rise
Genetics play a role in how your body responds to any dietary fat. One study looked at how different apolipoprotein E genotypes (a gene variant that affects cholesterol metabolism) influenced the response to an olive oil-rich diet. Depending on their genotype, participants showed different changes in LDL particle size and lipid levels after eating the same olive oil-rich diet for four weeks.24The Journal of Nutrition. The Effect of Dietary Fat on LDL Size Is Influenced by Apolipoprotein E Genotype in Healthy Subjects This helps explain why your neighbor might swear that olive oil raised their cholesterol while your doctor sees no change in yours.
People with familial hypercholesterolemia, a genetic condition that causes very high LDL from birth, are another important case. A study of this population found that greater adherence to a Mediterranean-style diet (which is heavy in olive oil) was actually associated with lower LDL, lower apolipoprotein B, and lower inflammatory markers, even after adjusting for cholesterol-lowering medications.25Nutrition, Metabolism and Cardiovascular Diseases. Adherence to a Mediterranean diet, dyslipidemia and inflammation in familial hypercholesterolemia That is reassuring for people who worry that a high-risk genetic background makes olive oil dangerous. The evidence suggests the opposite, though anyone with familial hypercholesterolemia should obviously be working closely with their doctor on lipid management.
The FDA Health Claim and What It Actually Says
In 2018, the U.S. FDA allowed a qualified health claim for oils high in oleic acid, including olive oil, stating that replacing saturated fats with oleic acid may reduce coronary heart disease risk. The European Food Safety Authority has approved its own health claims for olive oil polyphenols, specifically hydroxytyrosol, for protecting LDL from oxidation.26PubMed Central. Virgin Olive Oil Ranks First in a New Nutritional Quality Score Due to Its Compositional Profile – Section: 2.1. Recommended Dietary Intakes and Health Claims Notice the framing in both cases: neither agency claims olive oil lowers LDL in isolation. The FDA claim is about replacement of saturated fat. The EFSA claim is about protecting LDL from oxidation, not reducing its quantity. Both agencies have been careful to distinguish between the LDL number and what actually matters for heart disease, a distinction that the research increasingly supports.