Coconut Oil and Cholesterol: The Effect on LDL & HDL

Coconut oil raises both LDL (“bad”) cholesterol and HDL (“good”) cholesterol when compared with other plant-based cooking oils, according to a large meta-analysis of clinical trials published in Circulation. The net cardiovascular meaning of that double rise is genuinely unsettled, because no study has tracked whether people who swap in coconut oil actually have more heart attacks or strokes. That gap between what we can measure in blood work and what we can prove about health outcomes is central to understanding why coconut oil remains so contentious.

What the Clinical Trials Show for LDL

The most comprehensive look at coconut oil and blood lipids comes from a 2020 meta-analysis pooling 16 clinical trials. Compared with nontropical vegetable oils like soybean, olive, canola, and safflower, coconut oil raised LDL cholesterol by about 10 mg/dL on average.¹ That is a meaningful bump. For someone with an LDL of 120, adding roughly 10 points would push them into a range many doctors flag for closer monitoring.

The picture shifts, though, when coconut oil is compared with animal fats. A separate systematic review found that coconut oil significantly lowered LDL relative to animal fats like butter and lard.² A head-to-head randomized trial confirmed the same pattern: butter raised LDL substantially more than coconut oil, while coconut oil and olive oil produced virtually identical LDL changes.³ So coconut oil lands somewhere in the middle of the fat spectrum: worse for LDL than most liquid plant oils, but clearly better than butter.

One recent meta-analysis focused specifically on virgin coconut oil and found that its effect on LDL did not reach statistical significance, though the trend still pointed upward.⁴ This hints that the processing method and purity of the oil may matter, a point worth coming back to.

The HDL Side of the Equation

If coconut oil only raised LDL, the conversation would be straightforward. But it also raises HDL, the cholesterol fraction linked with lower cardiovascular risk. Across the same 16-trial meta-analysis, coconut oil boosted HDL by about 4 mg/dL compared with nontropical vegetable oils.¹ A smaller randomized crossover trial in healthy volunteers found an even larger HDL jump of about 6 mg/dL with daily virgin coconut oil.⁵

Proponents of coconut oil lean on this HDL increase to argue that the total cholesterol ratio improves, which historically has been considered a better predictor of heart disease than LDL alone. The trouble is that drug trials targeting HDL have generally failed to translate higher HDL numbers into fewer heart attacks. Whether coconut oil’s HDL boost is genuinely protective or just a lab number that looks good on paper remains an open question. HDL raised through diet may behave differently from HDL raised through medication, but the evidence to confirm that is thin.

Why Lauric Acid Behaves Unusually

Coconut oil is unusual among cooking fats because roughly half its fatty acids come from lauric acid, a 12-carbon chain that sits on the boundary between medium-chain and long-chain fatty acids.⁶ This matters because the body handles medium-chain fats quite differently from the long-chain saturated fats in butter and red meat. Medium-chain fats are absorbed more quickly and routed directly to the liver for energy, rather than being packed into the particles that carry cholesterol through the bloodstream.

Lauric acid does not fit neatly into either camp. Structurally, it is classified as a medium-chain fatty acid. But metabolically, a portion of it gets processed like longer-chain saturated fat. A structured review found that lauric acid serves as a building block for both apolipoprotein A1, the protein backbone of HDL particles, and apolipoprotein B, the protein backbone of LDL particles.⁷ This dual role explains why coconut oil pushes both LDL and HDL upward simultaneously, unlike butter, which mainly drives up LDL.

Animal research has investigated whether the saturated fats in coconut oil reduce the liver’s ability to clear LDL from the bloodstream. In monkeys fed coconut oil rich in lauric and myristic acids, LDL receptor activity dropped similarly to that seen with palmitic acid-rich diets.⁸ However, follow-up analysis suggested this receptor suppression was largely driven by the dietary cholesterol added to the experimental diets, not by the saturated fat alone. When cholesterol intake was low and the animals had normal baseline lipids, the saturated fat appeared to raise LDL more through increased production of LDL particles than through reduced clearance.⁹ The practical takeaway: coconut oil’s LDL-raising effect probably depends in part on what else you eat with it, especially how much cholesterol is in the rest of your diet.

No One Has Measured the Outcome That Matters Most

Here is the part that rarely makes it into headlines. Despite decades of debate, no randomized controlled trial and no prospective cohort study has ever measured whether coconut oil consumption leads to more or fewer heart attacks, strokes, or cardiovascular deaths.¹⁰ Every trial we have looked at changes in blood markers like LDL and HDL. Those markers are well-established risk indicators, but they are not the same thing as outcomes. The leap from “coconut oil raises LDL by 10 mg/dL” to “coconut oil increases your chance of a heart attack” requires assumptions that have not been directly tested.

This gap is important because coconut oil’s unusual lipid profile, raising both LDL and HDL while potentially producing a different type of LDL particle, makes the standard risk-extrapolation math less reliable. A trial comparing coconut oil users versus non-users over five to ten years, tracking actual cardiac events, would settle much of the debate. That trial does not exist, and running one would be enormously expensive and logistically difficult. So we are stuck interpreting surrogate markers with imperfect confidence.

Other Markers Beyond LDL and HDL

Cholesterol numbers get the most attention, but several other metabolic markers also shift when coconut oil enters the diet. One trial comparing coconut oil, butter, and safflower oil found that coconut oil produced lower levels of apolipoprotein B and lower lathosterol (a marker of how much cholesterol the body is making internally) than butter.¹¹ Lower apoB is generally considered favorable, since apoB count reflects the number of potentially harmful LDL particles in circulation, not just the amount of cholesterol they carry.

A recent crossover trial in people with elevated cardiometabolic risk examined what happens in the hours immediately after eating a coconut oil-rich meal versus a canola oil-rich meal. Triglycerides and the inflammatory marker IL-6 spiked higher after canola oil meals, while blood levels of lauric and myristic acid rose after coconut oil meals.¹² These acute postprandial responses are a reminder that the metabolic story of any dietary fat extends well beyond fasting cholesterol panels. How a fat behaves in the hours after you eat it may be just as relevant as its chronic effect on baseline lipids.

The Polynesian Populations

Coconut oil advocates frequently cite studies of Pacific Island populations who eat coconut as a staple. The best-known of these followed two groups of Polynesians living on atolls, the Pukapukans and the Tokelauans. Tokelauans got about 63% of their calories from coconut, while Pukapukans got about 34%.¹³ The Tokelauans had serum cholesterol levels 35 to 40 mg/dL higher than the Pukapukans, consistent with a dose-response effect from saturated fat. Yet vascular disease was uncommon in both groups, and researchers found no evidence that the high saturated fat intake was causing cardiovascular harm.

This seems like a powerful defense of coconut oil, but there are serious caveats. Both populations ate very little refined sugar and very little dietary cholesterol from animal products. They were also physically active and lean. Their diets bore almost no resemblance to the modern Western diets into which most people today would be adding coconut oil. When Tokelauans migrated to New Zealand and shifted toward a Western eating pattern, their lipid profiles and health outcomes changed.¹⁴ The lesson is that coconut consumed in the context of a traditional Pacific Island diet likely behaves very differently from coconut oil added to a diet already high in processed food, sugar, and other saturated fats.

Virgin Coconut Oil Versus Refined

Not all coconut oil is the same product. Virgin coconut oil (VCO) is extracted from fresh coconut meat without high heat or chemical solvents, preserving polyphenols and other minor bioactive compounds. Refined coconut oil undergoes bleaching and deodorizing, which strips out most of those compounds while leaving the fatty acid profile largely intact.

The meta-analysis focused on VCO specifically found that its LDL-raising effect fell short of statistical significance, unlike the broader analysis that lumped all types together.⁴ It is tempting to conclude that VCO is “safer,” but the confidence intervals were wide, meaning the true effect could still easily include a clinically meaningful LDL increase. What we can say is that VCO’s retained polyphenols may offer some offsetting benefit through antioxidant or anti-inflammatory activity, but the evidence is still too thin to confidently separate VCO from refined coconut oil in terms of cardiovascular risk.

Animal research supports the idea that VCO has anti-inflammatory properties. In mice fed a high-sugar, high-refined-carbohydrate diet, adding VCO reduced inflammatory markers in fat tissue and lowered circulating immune cell counts compared with controls.¹⁵ A small human trial in COVID-19 patients also reported that VCO supplementation lowered C-reactive protein, a broad marker of systemic inflammation.¹⁶ These are interesting signals, but mouse studies often fail to translate to humans, and the COVID-19 trial was small and conducted under unusual clinical circumstances. Neither result is strong enough to override the cholesterol data when making dietary decisions.

The Perception Gap

Surveys consistently show that the general public views coconut oil more favorably than nutrition scientists do. Much of that gap traces to marketing that emphasized coconut oil’s medium-chain fat content and framed it as a “superfood” for weight loss and heart health. The reality from clinical trials is less exciting: the same meta-analysis that documented the LDL and HDL effects found no significant benefits for body weight, fasting blood glucose, or markers of inflammation when coconut oil was compared with other vegetable oils.¹

The confusion is partly understandable. Pure medium-chain triglyceride (MCT) oil, which is sold separately as a supplement, genuinely does behave differently in the body from long-chain saturated fats. MCT oil is almost entirely caprylic and capric acid (C8 and C10), which bypass normal fat digestion and go straight to the liver. Coconut oil contains some of these shorter chains, but the majority of its fat is lauric acid (C12), which, as described earlier, straddles the line between medium-chain and long-chain metabolism. Assuming coconut oil will give you the same metabolic effects as MCT oil is a common mistake.

Who Should Be Most Cautious

If your LDL is already elevated, or if you have a family history of early heart disease, coconut oil’s LDL-raising effect matters more to you than to someone with naturally low cholesterol. The roughly 10 mg/dL average increase seen in trials is an average; some individuals may see a larger jump due to genetic variation in how they process saturated fat.

People who are replacing butter, lard, or other animal fats with coconut oil are probably making a lipid-neutral or mildly beneficial swap, based on the trial data showing coconut oil performs similarly to or better than animal fats on LDL.² People who are replacing olive oil, canola oil, or other unsaturated plant oils with coconut oil are likely moving their LDL in the wrong direction.¹ The question is never just “is coconut oil good or bad?” It is always “compared with what?”

Coconut Oil and the Gut Microbiome

An emerging line of research looks at how different dietary fats reshape gut bacteria, which may in turn influence cholesterol metabolism and inflammation. In a controlled mouse study, a high-fat diet based on coconut oil produced a distinctly different microbial profile from one based on soy oil. Mice fed coconut oil had higher plasma cholesterol after eight weeks, along with increased abundance of certain bacterial groups and decreased levels of Akkermansia muciniphila, a species associated with metabolic health.¹⁷ Whether these microbial shifts matter for human cardiovascular risk is unknown, but the finding underscores that coconut oil’s effects extend beyond simple fat digestion and cholesterol synthesis. The gut microbiome is one more variable that could help explain why population-level data and individual experiences with coconut oil sometimes diverge so dramatically.

1
PubMed. The Effect of Coconut Oil Consumption on Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis of Clinical Trials
2
PubMed. Impact of coconut oil consumption on cardiovascular health: a systematic review and meta-analysis
3
PubMed Central. Randomised trial of coconut oil, olive oil or butter on blood lipids and other cardiovascular risk factors in healthy men and women
4
PubMed Central. The effect of virgin coconut oil (VCO) on cardiovascular disease risk factors: a systematic review and meta-analysis
5
PubMed Central. Daily Consumption of Virgin Coconut Oil Increases High-Density Lipoprotein Cholesterol Levels in Healthy Volunteers: A Randomized Crossover Trial
6
Journal of the American Oil Chemists’ Society. The Properties of Lauric Acid and Their Significance in Coconut Oil
7
PubMed. Coconut oil intake and its effects on the cardiometabolic profile – A structured literature review
8
PubMed. LDL receptor activity is down-regulated similarly by a cholesterol-containing diet high in palmitic acid or high in lauric and myristic acids in cynomolgus monkeys
9
Prostaglandins Leukotrienes and Essential Fatty Acids. Saturated fatty acids and LDL receptor modulation in humans and monkeys
10
PubMed Central. Coconut Oil and Cardiovascular Disease Risk
11
European Journal of Clinical Nutrition. Effects of dietary coconut oil, butter and safflower oil on plasma lipids, lipoproteins and lathosterol levels
12
PubMed Central. Postprandial Responses to Meals Enriched With Canola or Coconut Oil in Men and Women With a Risk Phenotype for Cardiometabolic Diseases: A Randomized Crossover Trial
13
PubMed. Cholesterol, coconuts, and diet on Polynesian atolls: a natural experiment: the Pukapuka and Tokelau island studies
14
Journal of Chronic Diseases. The Tokelau island migrant study: Serum lipid concentrations in two environments
15
PubMed. Virgin coconut oil is effective to treat metabolic and inflammatory dysfunction induced by high refined carbohydrate-containing diet in mice
16
PubMed Central. Virgin coconut oil is effective in lowering C-reactive protein levels among suspect and probable cases of COVID-19
17
BMC Genomics. Differential effects of coconut versus soy oil on gut microbiota composition and predicted metabolic function in adult mice