Cooking Fats by the Numbers, Saturated Fat vs Linoleic Acid
The stable saturated fats people cooked with for generations behave nothing like the seed oils that replaced them. Here's how common cooking fats compare on saturated fat versus fragile linoleic acid.
The stable, saturated fats people cooked with for generations hold up to heat and time, while the industrial seed oils that replaced them are built mostly from a fragile fat called linoleic acid.
Why the type of fat matters
Saturated fat is chemically stable. Its molecules have no weak points for oxygen to attack, so it resists going rancid, even under heat. Linoleic acid, the main omega-6 polyunsaturated fat in seed oils, is the opposite, with multiple double bonds that make it fragile, so it oxidizes when you cook with it and throws off reactive byproducts. (We get into that chemistry in our posts on seed oils and saturated fat.)
Blasbalg and colleagues estimated that linoleic acid intake climbed several-fold over the last century as seed oils flooded the food supply [1]. The long campaign against saturated fat has also failed to hold up. In a 2010 meta-analysis, Siri-Tarino and colleagues found no clear link between saturated fat and heart disease [2]; in their reanalysis of recovered trial data, Ramsden and colleagues found that swapping saturated fat for linoleic acid lowered cholesterol without cutting coronary deaths [3]; and DiNicolantonio and O'Keefe argue oxidized linoleic acid itself is the more likely culprit [4].
The best saturated fats to cook with
The most stable cooking fats are also the most traditional. As a share of total fat, the standouts are coconut oil at roughly 90% saturated, butter and ghee at about 62 to 63%, cocoa butter near 60%, and beef tallow around 50%. Whole foods follow the same pattern, since fatty cuts of grass-fed beef and lamb, full-fat dairy like cheese and cream, and egg yolks all give you saturated fat in a stable, nutrient-dense package. They also carry little linoleic acid, which is exactly what makes them good for high heat.
The chart, saturated fat vs linoleic acid
Here's the breakdown for common cooking fats, as a rough share of total fatty acids. The list runs from lowest linoleic acid (most stable) to highest.
| Fat or oil | Saturated fat | Linoleic acid (omega-6) |
|---|---|---|
| Coconut oil | ~90% | ~2% |
| Ghee | ~62% | ~2% |
| Butter | ~63% | ~3% |
| Cocoa butter | ~60% | ~3% |
| Beef tallow | ~50% | ~3% |
| Palm oil | ~49% | ~9% |
| Lard | ~40% | ~10% |
| Olive oil (extra virgin) | ~14% | ~10% |
| Avocado oil | ~12% | ~13% |
| Canola oil | ~7% | ~19% |
| Peanut oil | ~17% | ~32% |
| Soybean oil | ~15% | ~51% |
| Cottonseed oil | ~26% | ~52% |
| Corn oil | ~13% | ~54% |
| Sunflower oil | ~10% | ~66% |
| Grapeseed oil | ~10% | ~70% |
| Safflower oil | ~8% | ~75% |
A note on the numbers, they're approximate and shift with the source, brand, and variety. Sunflower and safflower oils, for instance, also come in "high-oleic" versions with far less linoleic acid than the standard high-linoleic types shown here.
What this means
Cook with a fat that's mostly saturated and low in linoleic acid, and you get a fat that stays stable in the pan and doesn't flood you with fragile omega-6. Coconut oil, butter, ghee, and tallow sit at the top of that list. The seed oils at the bottom of the chart are the ones worth minimizing, especially for frying, where heat drives oxidation hardest. Your overall metabolic health is still the bigger picture, but the oil in your pan is a simple, low-effort swap.
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References
- Blasbalg TL, et al. Changes in consumption of omega-3 and omega-6 fatty acids in the United States during the 20th century. Am J Clin Nutr. 2011. PMID: 21367944
- Siri-Tarino PW, et al. Meta-analysis of prospective cohort studies evaluating the association of saturated fat with cardiovascular disease. Am J Clin Nutr. 2010. PMID: 20071648
- Ramsden CE, et al. Re-evaluation of the traditional diet-heart hypothesis: analysis of recovered data from Minnesota Coronary Experiment (1968-73). BMJ. 2016. PMID: 27071971
- DiNicolantonio JJ, O'Keefe JH. Omega-6 vegetable oils as a driver of coronary heart disease: the oxidized linoleic acid hypothesis. Open Heart. 2018. PMID: 30364556