While saturated fat raises cholesterol, the science is actually more specific. Three specific saturated fats—lauric, myristic, and palmitic—drive most increases in LDL cholesterol and ApoB. This explains why dark chocolate (rich in stearic acid) is good for the heart, whereas coconut oil isn’t. It also explains why some fatty foods, like avocados, are actually heart-healthy.

In this post, I’ll review lateest science on saturated fat and heart disease. We’ll break down specific foods like chocolate, coconut oil, and avocadoes, and explain why not are all saturated fats are bad for you. Last, we’ll summarize some practical ways to use this science in your day to day life.

Limiting saturated fat is an important part of heart health, and acts alongside other nutrients like fiber

Three saturated fats matter the most: lauric, myristic, and palmitic acid

Lauric, myristic, and palmitic acids acids are the strongest drivers of LDL cholesterol. Every saturated fat consists of a carbon chain; the difference between them is how many carbon atoms they have. Lauric acid has 12 carbons, myristic has 14, and palmitic has 16:

Fatty acid	Carbon chain	Relative potency	Primary food sources
Lauric acid (C12:0)	12 carbons	Moderate	Coconut oil, palm kernel oil
Myristic acid (C14:0)	14 carbons	Highest per gram	Dairy fat, coconut oil, nutmeg
Palmitic acid (C16:0)	16 carbons	Moderate, but highest total impact	Palm oil, meat, dairy, most foods

By the gram, myristic acid raises cholesterol the most. In a head-to-head trial by Zock et al. (1994), a myristic acid-enriched diet produced mean serum cholesterol of 5.19 mmol/L versus 4.96 mmol/L for palmitic acid. But palmitic acid is the biggest contributor to population-level LDL elevation for a simple reason: we eat far more of it. Palmitic acid accounts for roughly 55–60% of total saturated fat intake in Western diets (about 20–30 g per day). It’s the most common saturated fatty acid in meat, dairy, and palm oil. This means palm oil does raise cholesterol.

Lauric acid is an interesting case. While lauric acid raises total cholesterol, it raises HDL more than LDL. This means lauric acid actually improves the total-to-HDL cholesterol ratio, complicating simple risk assessments. Still, it reliably raises LDL, and LDL remains the primary causal factor in atherosclerosis.

How specific foods vary in their saturated fat

Some saturated fatty acids don’t raise cholesterol

First, here’s a table of how various specific saturated fats affect heart disease risk:

How different saturated fats affect heart disease risk (source).

Not all saturated fats are bad for you. In particular, saturated fats with shorter carbon chains don’t raise cholesterol since they’re processed using a different metabolic pathway.

Dark chocolate is high in stearic acid

You’ve probably heard chocolate is good for the heart, even though it’s high in saturated fat. This is because most of the saturated fat in cholesteorl is stearic acid.

Stearic acid is an 18-carbon saturated fat found abundantly in cocoa butter, beef fat, and shea butter It has a neutral effect on LDL cholesterol because your liver rapidly converts stearic acid to oleic acid (a monounsaturated fat). This happens via the enzyme stearoyl-CoA desaturase. Metabolically, eating stearic acid is similar to eating olive oil.

Coconut oil is surprisingly unhealthy

Coconut oil has all three cholesterol-raising saturated fatty acids. Coconut oil is approximately 50% lauric acid, 18% myristic acid, and 8% palmitic acid. A 2020 meta-analysis in Circulation confirmed that coconut oil significantly raises LDL cholesterol, compared to nontropical vegetable oils.

The Mar 2026 AHA dietary guidelines group coconut oil, cocoa butter, and palm oil together as tropical oils that are “relatively high in saturated fat,” and state that replacing tropical plant oils with nontropical plant oils (soybean, canola, olive oils) also lowers LDL cholesterol.

The common claim that coconut oil is “healthy” because it raises HDL doesn’t hold up under scrutiny. While coconut oil does increase HDL, raising HDL pharmacologically has not been shown to reduce cardiovascular events. (This finding has been replicated by multiple failed HDL-raising drug trials). The ApoB/LDL increase is the more important signal.

Butter and short- and medium-chain fatty acids (C4–C10)

Butter does raises your LDL cholesterol. The primary saturated fats in butter are palmitic acid (33%), stearic acid, myristic acid, and butyric acid (about 10% each). Since palmitic acid and myristic acid raise LDL cholesterol, butter will overall have a negative effect on your cholesterol levels but can be consumed in moderation.

Saturated fats with fewer than 12 carbons, like butyric acid, follow a different metabolic route entirely. They’re absorbed directly into the portal vein rather than being packaged into chylomicrons. That means short-chain fats have negligible effects on cholesterol. However, since butter has large amounts of palmitic and myristic acid, it still drives up LDL cholesterol or ApoB.

How much saturated fat per day if you have high cholesterol

If you have high cholesterol, limit saturated fat to 6% of total calories. For a 2,000 calorie diet, this means limit saturated fat to 13 grams or less.

What you replace the saturated fat with matters enomously. Cutting saturated fat only helps if you replace it with something better. Here are the best replacements for staurted fat:

1. Replacing saturated fat with polyunsaturated fat (PUFA) produces clear cardiovascular benefit. A pooled analysis estimated every 5% of energy shifted from saturated to polyunsaturated fat reduces CVD risk by 10% reduction. This aligns closely with the predicted LDL reduction.
2. Replacing saturated fat with monounsaturated fat (MUFA), such as olive oil, avocados, nuts, also lowers LDL effectively. However, fewer randomized trial data exist for hard cardiovascular endpoints.
3. Replacing saturated fat with refined carbohydrates is not helpful. LDL decreases, but triglycerides rise, HDL falls, and the net effect on cardiovascular events is neutral. This is the substitution that confused a generation of nutrition science: when the low-fat movement of the 1980s and ’90s replaced butter with white bread and sugar, heart disease didn’t budge.
4. Replacing saturated fat with whole grains or plant protein is beneficial. A 2016 Harvard analysis found that replacing 1% of calories from palmitic acid with plant proteins or polyunsaturated fat was associated with an 11–12% reduction in coronary heart disease risk.

The science of saturated fat and heart disease

Even the earliest studies on how diet affects cholesterol noted that not all saturated fats are created equal.

Controlled feeding studies of saturated fats

In 1965, Mark Hegsted and Ancel Keys independently derived equations predicting how dietary fats affect serum cholesterol from metabolic ward studies. Both recognized early on that not all saturated fats behave the same. Keys explicitly noted that stearic acid and saturated fatty acids with fewer than 12 carbons have “negligible effects” on serum cholesterol.

In 1993, Ronald Mensink published a focused review in the American Journal of Clinical Nutrition examining how individual saturated fatty acids differ in their effects on serum lipids. This 1993 paper laid the groundwork for everything that followed, establishing the core thesis: “saturated fatty acids are not all equally hypercholesterolemic: stearic acid (18:0) and saturated fatty acids with < 12 carbon atoms are thought not to raise serum cholesterol concentrations.”

Blood cholesterol concentration vs. individual saturated fatty acids. Source: American Journal of Clinical Nutrition

Mensink showed that while lauric, myristic, and palmitic acid all raised serum cholesterol, their potencies differed, with myristic acid appearing more potent than palmitic, and lauric acid’s effect being somewhat weaker. The definitive analysis came 10 years later, in Mensink’s 2003 meta-analysis of 60 controlled dietary trials. By pooling data across thousands of participants, Mensink quantified the effect of each individual fatty acid on blood lipids when substituted for carbohydrates. Lauric, myristic, and palmitic acid all significantly raised LDL cholesterol. Stearic acid (C18:0) had no significant effect on LDL. All three cholesterol-raising fatty acids also raised HDL, with lauric acid having the strongest HDL-raising effect. This analysis provided the clearest evidence that the cholesterol-raising effect of “saturated fat” is really the effect of three specific molecules.

The American Heart Association’s 2017 advisory by Sacks et al. reviewed the full body of evidence from randomized controlled trials and concluded that replacing saturated fat with polyunsaturated fat reduced cardiovascular events by approximately 30% (an effect size comparable to statins).

How your liver processes saturated fats

Your liver has an enzyme called ACAT (acyl-CoA:cholesterol acyltransferase) which packages cholesterol for storage by esterifying it. Compared to unsaturated fats, saturated fats are poor substrates for the ACAT enzyme. When palmitic, myristic, and lauric acid arrive at the liver, they can’t efficiently feed the ACAT reaction. That causes free cholesterol to accumulate inside liver cells. The buildup suppresses SREBP-2, a transcription factor that controls LDL receptor production. With fewer LDL receptors on liver cell surfaces, less LDL is cleared from the bloodstream, causing blood LDL cholesterol to rise. Unsaturated fatty acids do the opposite: they’re good ACAT substrates, which keeps free cholesterol low, SREBP-2 active, LDL receptors plentiful, and blood LDL low.

What about oxidation and inflammation?

The three fatty acids raise ApoB, but ApoB is only one of six cardiovascular risk factors. In the discussion section of his 1993 review, Mensink raised a point that remains relevant today — the role of antioxidants in modifying how dangerous those LDL particles actually are:

“Antioxidants like vitamin E, I think, have no effect on these concentrations but they may reduce the atherogenicity of lipoproteins, and of the LDL particles in particular, by preventing their oxidative modification and subsequent uptake by macrophages.”

In other words, even if your LDL is elevated, the degree to which those particles get oxidized (and subsequently engulfed by immune cells in artery walls) matters for whether atherosclerosis actually progresses. Vitamin E and other antioxidants don’t change how much LDL is in your blood, but they may change how much damage it does once it’s there. The American College of Cardiology now recommends that everybody measure inflammation (hs-CRP) for heart health.

TL;DR: saturated fat, cholesterol, & heart health

Tracking saturated fat with Empirical Health. These are tracked as density per calorie, as well as overall ratio of fiber to saturated fat.

The details of how saturated fat and cholesterol is more nuanced that it fist appears. Focus on palmitic, myristic, and lauric acids. Track rigorously. And replace saturated fat with unsaturated fats, not refined carbs.