In one pass Lauric acid, the main fat in coconut oil, behaves in the body more like a long-chain saturated fat, and it raises the bad cholesterol in your blood (LDL). Not this — Coconut oil is a healthy superfat (MCT fat-burner) — Coconut oil is about 82% saturated fat, and its main fatty acid, lauric acid, raises LDL (bad) cholesterol. A pooled analysis of 16 trials (Neelakantan 2020, Circulation) found it raises LDL compared with vegetable oils and burns no fat; the American Heart Association (2017) advises against it.
Educational content, not medical advice — consult a clinician.
Lauric acid, the main fat in coconut oil, behaves in the body more like a long-chain saturated fat, and it raises the bad cholesterol in your blood (). How it pushes LDL up is covered in the chapter on why it is simply saturated fat.
Coconut oil was sold as a healthy superfat on a borrowed name: medium-chain (MCT). The fats that made MCTs famous are caprylic and capric acid (C8 and C10). Coconut oil's main fat is lauric acid (C12), which carries the medium-chain name but is not handled the way they are. A little in cooking is fine; what does not hold up is eating it every day as a health oil.
Myth · Four claims sold as one
Over the past decade, coconut oil went from a tropical cooking fat to a wellness star. The marketing goes roughly like this: a natural superfat, rich in medium-chain (MCT), that fuels you directly, trims belly fat, raises good cholesterol, feeds the brain, and fights Alzheimer's disease. Bottles say cold-pressed, virgin, keto-friendly, and cost several times as much as ordinary cooking oils.
The story bundles four assertions together:
Coconut oil is a healthy fat you can use freelyIts MCTs speed up metabolism and cut fatIt raises good cholesterol, so it is good for the heartIt is brain food that improves thinking The point is not that coconut oil is poison; a little in cooking is fine. The point is that the superfat label promises far more than a bottle of mostly lauric acid can deliver. The American Heart Association advises against using it as an everyday health oil, as the chapter on blood-fat studies explains. For the full picture of fat types, see Fat Types; for the demonized other end (seed oils), see Seed Oils / Linoleic Acid. The two stories are two sides of one coin.
Chapter 2
Mistaken for a medium-chain fat
The core marketing line is that coconut oil is rich in MCTs (medium-chain ). A switch is hidden in that sentence.
True MCT oil is purified C8 and C10, which do not need to be packaged in the small intestine and can travel through the portal vein straight to the liver. Coconut oil's main fat is lauric acid (C12): by chemical classification it just barely counts as medium-chain, but in the body it is handled more like a long-chain saturated fat.
Mechanism · The route true MCTs take
MCT oil is a genuinely researched product. Pure MCT oil is made mainly of caprylic acid (C8) and capric acid (C10). These shorter medium-chain fatty acids need little help from bile, travel through the portal vein directly to the liver, are used quickly for energy, and have a smaller effect on blood fats. The oil used in sports nutrition and ketogenic diets is this purified C8 and C10 MCT oil.
So in the claim that coconut oil is rich in MCTs, the part about what MCTs do is true. The problem is that this shortcut was pinned onto a bottle with a completely different makeup.
Mechanism · Lauric acid takes the other road
The most abundant fatty acid in coconut oil is not C8 or C10 but lauric acid (C12), which by common composition analyses makes up about half of coconut oil's fat. Lauric acid nominally counts as medium-chain, but it is handled more like a long-chain saturated fat: most of it is packed into chylomicrons (the large particles the small intestine packages fat into), carried through the lymphatic system, and it raises (the bad cholesterol on a lab report). Mensink 2003, a pooling controlled feeding trials, found that lauric acid raises serum total cholesterol and LDL cholesterol, behaving like an LDL-raising saturated fat rather than like C8 or C10.
In other words, the marketing borrowed the portal-vein, quick-energy story that holds for C8 and C10 and pasted it onto a bottle that is mostly C12. It is the classic move of taking one molecule's property and assigning it to a whole bottle of different molecules.
Chapter 3
It is simply saturated fat
Lay out coconut oil's fat makeup and the marketing halo fades. What matters is not the medium-chain label but what lauric acid does, once it reaches the liver, to the row of hooks that pull (the bad cholesterol) back out of the blood.
As currently understood, long-chain saturated fats, and lauric acid that behaves like them, leave the liver cells with fewer LDL receptors on their surface. With fewer hooks, LDL is cleared from the blood more slowly and its level rises. What really bypasses this route is C8 and C10, not the main fat in this bottle.
A CLOSER LOOK
Fewer hooks to recover LDL
The 'medium-chain' label does not erase the difference between lauric acid and C8 or C10.
1Receptors act like recovery hooks
As currently understood, long-chain saturated fats and long-chain-like lauric acid reduce LDL receptors on liver-cell surfaces.
2Clearance affects blood concentration
With fewer hooks, LDL clears more slowly and its blood concentration rises. C8 and C10 do not represent the main fat in coconut oil.
Illustration for understanding; not to scale. Saved figures include explanations and sources.
Numbers · How saturated coconut oil is
By weight of the oil, coconut oil is about 82% saturated fat (the American Heart Association's 2017 figure), far higher than butter or lard. The so-called tropical health oil is in fact one of the most saturated common cooking fats. This is a simple, uncontested fact about its makeup.
How saturated it is does not yet explain anything by itself. The mechanism is what these saturated fatty acids do, once they enter liver cells, to the row of hooks that recover (the bad cholesterol).
Mechanism · Fewer LDL receptors on the liver
As currently understood (this link rests mainly on animal and cell studies), long-chain saturated fats, and C12 that behaves like them, reduce the number of receptors (LDLR) on the liver for , the low-density lipoprotein particles that carry the bad cholesterol. LDLR is the hook that liver cells use to pull LDL particles back out of the blood; with fewer hooks, LDL is cleared more slowly and its level rises. Lauric acid, myristic acid (C14), and palmitic acid (C16) all work this way. And raised LDL cholesterol (LDL-C, the bad cholesterol on a lab report) is a causal risk factor for atherosclerosis and cardiovascular disease, one of the most solid conclusions in modern cardiovascular medicine.
What really bypasses this cholesterol-raising route is C8 and C10: they go straight to the liver through the portal vein and are burned for energy first. But C8 and C10 together usually make up less than 15% of coconut oil, and the main fat, C12, takes the LDL-raising route. So if you buy coconut oil for the metabolic properties of MCT oil, what you mostly get is lauric acid, not the part of MCT oil that does the work.
At the level of mechanism the conclusion is clear: coconut oil is an LDL-raising saturated fat, and its medium-chain label is misleading.
Chapter 4
What studies show about blood fats
Coconut oil's effect on blood fats is one of the rare topics where the evidence lines up.
Compared with non-tropical vegetable oils such as olive and canola oil, it raises (the bad cholesterol) and also raises (the good cholesterol), while body weight and body fat do not change. The American Heart Association (AHA) advises against using it as a health oil, because it raises LDL and has no known benefit that offsets this. No rigorous human trial supports using it to treat Alzheimer's disease.
Evidence · It raises LDL versus vegetable oils
Neelakantan 2020, a systematic review and published in Circulation, pooled 16 clinical trials that compared coconut oil with non-tropical vegetable oils (olive, canola, sunflower, and others). Coconut oil raised (low-density lipoprotein cholesterol, the bad cholesterol) by about 10 mg/dL on average and also raised (high-density lipoprotein cholesterol, the good cholesterol). It had no significant effect on blood sugar, markers of inflammation, or measures of body weight and body fat.
The crucial part is the second half: in these trials, body weight and body fat did not differ. Marketing described coconut oil as an MCT that trims belly fat, and human trials did not bear that out. Whether the HDL rise offsets the LDL rise gets its own discussion in the chapter on why it is not poison, just overhyped.
Evidence · The AHA verdict, and Alzheimer's
The AHA's 2017 presidential advisory (Sacks and colleagues, Circulation): after a systematic review of the evidence, the American Heart Association explicitly advised against using coconut oil, because it raises (low-density lipoprotein cholesterol, the bad cholesterol, one of the causes of cardiovascular disease) and has no known benefit that offsets this. The advisory's central recommendation is to replace saturated fat with unsaturated fat; in randomized trials, replacing saturated fat with polyunsaturated vegetable oil cut cardiovascular disease by about 30%. No study so far shows that coconut oil lowers cardiovascular disease.
The evidence for using coconut oil to treat Alzheimer's disease falls short. The liver can make small amounts of ketones from coconut oil, which is where the idea of ketones fueling the brain comes from. But to date no rigorously designed randomized human trial has shown that coconut oil prevents or treats Alzheimer's disease (Science Feedback's assessment: current evidence does not support the claim, and only a handful of small pilot studies exist). It is a textbook case of an interesting mechanism that has not paid off in the clinic.
Putting it together: the LDL rise is backed by a ; body weight and body fat did not change significantly in those trials; and there is not enough human evidence for treating Alzheimer's disease.
Chapter 5
Not poison, just overhyped
Debunking is not demonizing. A few things about coconut oil are true and deserve to be said plainly: it really does raise (the good cholesterol); a little in cooking is fine; and in traditional cooking it sits inside an entirely different overall diet.
But counting on a higher HDL to offset a higher (the bad cholesterol) does not hold up: some drugs that push HDL very high did not bring a matching cardiovascular benefit in large trials.
Myth · A higher HDL does not cancel a higher LDL
In the Neelakantan 2020 , coconut oil raised not only (the bad cholesterol) but also (the good cholesterol). The old claim that coconut oil protects the heart rested partly on this. But the consensus in modern cardiovascular medicine is that betting on a higher HDL to offset a higher LDL is unreliable. Some drugs that push HDL very high did not bring a matching cardiovascular benefit in large trials, and the target with real causal evidence is lowering LDL. So it is true that coconut oil also raises good cholesterol, but that is not enough to rebrand it as a heart-protective oil.
AHA 2017 puts it bluntly: it raises LDL-C and has no known benefit that offsets this. The small HDL rise was not counted as a benefit that could offset it.
In practice · A little in cooking, not a daily spoon
Nutrition is about total amounts and the overall pattern of your diet. In a healthy diet built mostly on unsaturated fats, now and then using coconut oil for a curry or a Southeast Asian-style dish is no problem at all. Coconut oil has a distinctive flavor and handles heat better than butter, and used sparingly as a flavor fat it is not harmful. What matters is its share of all the fat you eat, not the idea that one touch does harm.
In diets where coconut is traditionally a main source of fat (parts of the Pacific Islands and South Asian cuisines), it sits inside an entirely different overall diet. The trouble starts when a single food is lifted out of that context and turned into a supplement-style daily spoonful. Coconut oil is a flavor fat you can use, not a health supplement to chase.
Chapter 6
A flavor fat, not a health tonic
Coconut oil is neither a healthy superfat nor a poison. It is a highly saturated flavor fat.
Use unsaturated oils as your everyday cooking fat, and save coconut oil for dishes that want its flavor. If you want the metabolic properties of C8 and C10, buy pure MCT oil labeled with its contents; do not expect this bottle of coconut oil to stand in for it.
In practice · A flavor fat, not a health tonic
Not supported: that coconut oil is a healthy superfat, can stand in for MCT oil to cut fat, or is good for the heart. Human trials show that, compared with vegetable oils, it raises (the bad cholesterol) with no significant change in body weight or body fat, and the AHA advises against using it as a health oil. There is not enough human evidence for treating Alzheimer's disease.
Partly true but blown up: it really does raise (the good cholesterol), and it really does contain a small amount of true MCTs (C8 and C10), but that share is small and does not change the overall verdict; the higher HDL does not offset the higher LDL.
Where it really stands: a highly saturated flavor fat. A little, now and then, for flavor, is fine; chasing it as a daily health oil is heading the wrong way.
Low-risk steps you can take now:
Use unsaturated oils (olive, canola, and others) as your main everyday cooking fat, and save coconut oil for dishes that want its flavorIf you want the metabolic properties of MCTs, buy pure MCT oil labeled C8 and C10; do not expect coconut oil to stand in for itIf you are concerned about LDL or cardiovascular risk, focus on cutting your total saturated fat (including coconut oil, palm oil, and animal fats) and replacing it with unsaturated fatDo not pay the premium for virgin, cold-pressed coconut oil in pursuit of health benefits. The flavor is worth the price; the health claims are not
This page is health education only and does not replace a physician's or registered dietitian's judgment of your own blood-fat and cardiovascular situation.
References · 4
Sacks, F. M., Lichtenstein, A. H., Wu, J. H. Y., Appel, L. J., Creager, M. A., Kris-Etherton, P. M., et al. (2017). Dietary fats and cardiovascular disease: A presidential advisory from the American Heart Association. Circulation, 136(3), e1-e23. Coconut oil is ~82% saturated; the AHA advises against its use because it raises LDL-C with no known offsetting favorable effect, and recommends replacing saturated with unsaturated fat. 10.1161/CIR.0000000000000510
Neelakantan, N., Seah, J. Y. H., & van Dam, R. M. (2020). The effect of coconut oil consumption on cardiovascular risk factors: a systematic review and meta-analysis of clinical trials. Circulation, 141(10), 803-814. 16 articles, trials of at least 2 weeks vs other fats: coconut oil raised LDL-C by 10.47 mg/dL (3.01-17.94) and HDL-C by 4.00 mg/dL (2.26-5.73) vs nontropical vegetable oils, and did not significantly affect glycaemia, inflammation or adiposity. The abstract gives no total-cholesterol figure (abstract, PMID 31928080). 10.1161/CIRCULATIONAHA.119.043052
Mensink, R. P., Zock, P. L., Kester, A. D. M., & Katan, M. B. (2003). Effects of dietary fatty acids and carbohydrates on the ratio of serum total to HDL cholesterol and on serum lipids and apolipoproteins: a meta-analysis of 60 controlled trials. The American Journal of Clinical Nutrition, 77(5), 1146-1155. Lauric acid (C12, the dominant fatty acid in coconut oil) raises serum total and LDL cholesterol, behaving as an LDL-raising saturated fat rather than like C8/C10 MCTs. 10.1093/ajcn/77.5.1146