The omega-6 to omega-3 ratio is the proportion of two essential polyunsaturated fats in your diet. In evolutionary terms, researchers estimate humans ate them at roughly 1:1 for most of our history. In the modern United States, that ratio sits near 16.7:1 — and some Western diets reach 20:1 or higher, according to Artemis Simopoulos writing in Nutrients in 2016.
This post walks through what the ratio is, what the studies actually found, where scientists still disagree, and how beef tallow — the fat we cook TIPS Sea Salt chips in — fits into the picture.
What the omega-6 to omega-3 ratio means
Omega-6 and omega-3 are two families of polyunsaturated fats your body cannot make on its own. You have to get them from food. The main dietary omega-6 is linoleic acid (LA), found in the highest concentrations in refined seed oils such as soybean, corn, cottonseed, sunflower, and safflower. The main dietary omega-3s are alpha-linolenic acid (ALA) from plants, and EPA and DHA from fish.
The ratio refers to how much omega-6 you eat compared with how much omega-3. A 1:1 ratio means equal amounts. A 20:1 ratio means twenty times more omega-6 than omega-3 — the current Western norm.
How the ratio changed: from 1:1 to 20:1
The clearest account of the shift comes from Simopoulos in Nutrients (2016). Looking at dietary data over three decades, the author reported that total fat and saturated fat intake as a share of calories fell, while omega-6 intake climbed and omega-3 intake dropped. Together these changes pushed the omega-6 to omega-3 ratio from an evolutionary baseline of approximately 1:1 to roughly 16.7:1 in the current US diet, and as high as 20:1 or more in other Western populations.
The paper paralleled this fatty acid shift against the rise in overweight and obesity over the same period. Simopoulos proposed that the two trends are connected through five mechanistic pathways: adipogenesis (how pre-fat cells mature into fat cells), browning of adipose tissue (conversion of white fat to energy-dissipating brown fat), lipid homeostasis, the brain-gut-adipose tissue signaling axis, and systemic inflammation.
The mechanistic claim is still debated. What the paper established firmly is the arithmetic: the ratio has moved by more than an order of magnitude, and it moved inside a few generations.
The Ramsden studies: when cholesterol fell but mortality rose
If the ratio hypothesis is right, swapping saturated fats for omega-6-rich seed oils should produce worse outcomes, not better. Two recovered-data analyses led by Christopher Ramsden and colleagues tested exactly that substitution.
Sydney Diet Heart Study (2013, BMJ). A 1966–73 randomized controlled trial of 458 men aged 30–59 with a recent coronary event. The intervention group replaced saturated fat with omega-6 linoleic acid from safflower oil and safflower-based margarine. Controls received no specific dietary instruction. After follow-up of up to 83 months, the intervention group had higher all-cause mortality (17.6% vs 11.8%, hazard ratio 1.62, 95% CI 1.00–2.64), higher cardiovascular mortality (17.2% vs 11.0%, HR 1.70), and higher coronary heart disease mortality (16.3% vs 10.1%, HR 1.74).
Minnesota Coronary Experiment (2016, BMJ). A 1968–73 double-blind randomized trial of 9,423 participants in Minnesota state hospitals and a nursing home. The intervention replaced saturated fat with corn oil. The intervention group did achieve the target: mean serum cholesterol fell 13.8% (SD 13.0%) compared with a 1.0% fall in controls. But lower cholesterol did not translate into lower mortality. Pooling both groups, the researchers found that every 30 mg/dL drop in serum cholesterol was associated with a 22% higher risk of death (HR 1.22, 95% CI 1.14–1.32). Among participants aged 65 and over, the effect was stronger (HR 1.35).
Ramsden's team framed the finding as a direct challenge to the traditional diet-heart hypothesis: cholesterol reduction via a high-linoleic-acid substitution did not produce the expected survival benefit. The food chemistry behind that result — what actually happens when polyunsaturated oils are heated — is something we covered in detail in What Happens to Seed Oils When You Fry.
The counterpoint: biomarker studies defending linoleic acid
The Ramsden findings are not the last word. In September 2024, a review authored by Kristina Jackson, William Harris, Martha Belury, Penny Kris-Etherton, and Philip Calder in Lipids in Health and Disease argued the opposite case: higher blood levels of linoleic acid are associated with lower cardiometabolic risk.
Drawing on FORCE Consortium biomarker data, the authors reported that across interquintile comparisons, higher circulating linoleic acid was associated with a 7% lower risk of total cardiovascular disease, a 22% lower risk of fatal cardiovascular disease, a 12% lower risk of ischemic stroke, and a 35% lower risk of type 2 diabetes. They explicitly addressed Ramsden's reanalyses, writing that “a variety of rebuttals were published that challenged the Ramsden conclusions.”
Where does that leave a reader? With a real scientific disagreement. The 2024 review team argues the epidemiological biomarker data is stronger than the recovered-data RCTs. Ramsden's group argues the opposite. Randomized controlled trials from the 1960s and 1970s, reanalyzed with recovered data, point one way. Prospective biomarker studies from recent decades point the other way. The two designs answer different questions: RCTs test a deliberate dietary substitution over a fixed period; biomarker studies observe whatever free-living diets produced the blood levels researchers measured. Both have known limitations. Neither alone settles the question.
What the newest mechanistic research found
A March 2025 paper in Science by Koundouros and colleagues at Weill Cornell, led by senior author John Blenis, identified a direct cellular sensor for dietary linoleic acid. The fatty acid binding protein FABP5 was shown to bind linoleic acid and interact with mTORC1 — a central regulator of cell growth — to change its complex formation, substrate binding, and subcellular localization. In a mouse model of triple-negative breast cancer, a diet enriched with safflower oil (high in linoleic acid) promoted tumor growth via this pathway.
The finding does not translate directly to human diet advice, and the authors did not claim it did. But it adds a specific mechanism to an older association, and it is the kind of result that tends to reopen settled conversations rather than close them.
Where beef tallow fits in
Tallow — rendered beef fat — sits on the opposite side of the fatty acid map from seed oils. Its fatty acid profile is dominated by saturated and monounsaturated fats, with very little polyunsaturated fat, and therefore very little linoleic acid.
| Fat | Saturated | Monounsaturated | Polyunsaturated (LA + ALA) |
|---|---|---|---|
| Beef tallow | ~50% | ~42% | ~4% |
| Sunflower oil (high-linoleic) | ~10% | ~20% | ~66% |
| Soybean oil | ~15% | ~23% | ~58% |
| Corn oil | ~13% | ~28% | ~55% |
Values are approximate and drawn from USDA FoodData Central composition tables. Exact percentages vary by cultivar and processing.
For the ratio conversation, the relevant column is the third one. A potato chip fried in tallow picks up a fat with roughly 4% polyunsaturated content. A chip fried in high-linoleic seed oil picks up a fat with 55–66% polyunsaturated content, most of that linoleic acid. The food itself is the same potato; the cooking fat is what changes the omega-6 load.
Why TIPS cooks in 100% beef tallow
At the time of writing, most potato chip brands in the United States are cooked in refined seed oils — cottonseed, sunflower, corn, soybean, or blends of these. That is a cost decision. Seed oils are cheaper than tallow, shelf-stable, and easy to source at industrial scale.
TIPS starts from a different premise. The thesis of this brand, rooted in what researchers like Simopoulos have documented, is that the cooking fat is not a detail — it is the biggest single variable on the nutrition label of a chip. Our Variety Pack includes all three current flavors so you can try the tallow-cooked approach across different seasonings.
We use simple ingredients. Sea Salt is three ingredients. Our spicier flavors, including Jalapeño, use a few more to build the flavor profile. In every case, the frying fat is 100% beef tallow. No seed oil blends, no “high-oleic” hybrids, no bait-and-switch cost-down ingredients. The full thinking behind this — including how the American food industry arrived at its current seed-oil norm — lives on our pillar page at Seed Oil Free Chips, and in our blog post The History of Seed Oils in America.
The honest conclusion
The omega-6 to omega-3 ratio question is not settled. Simopoulos documents a real shift from 1:1 to 16.7:1 or higher over a short historical window. Ramsden's reanalyses of the Sydney and Minnesota trials show that swapping saturated fat for linoleic acid did not reduce mortality, and in the Sydney cohort appeared to raise it. Harris and colleagues, writing in 2024, argue that blood-biomarker data support the opposite conclusion. Koundouros and colleagues in Science show a specific cellular mechanism by which linoleic acid signals growth pathways.
Where does that leave a person who just wants to pick a chip? With a straightforward choice. If the ratio matters — and some of the strongest recent work suggests it might — then the dominant cooking fat in your snacks is a lever you can actually pull. Tallow is roughly 4% polyunsaturated. Seed oils are roughly 55–66%. That is not a subtle difference.
Frequently asked questions
What is the omega-6 to omega-3 ratio?
The omega-6 to omega-3 ratio is the proportion of two families of essential polyunsaturated fats in your diet. Evolutionary estimates place the human ratio near 1:1. Simopoulos (Nutrients, 2016) estimates the current US ratio at approximately 16.7:1, with some Western populations reaching 20:1 or higher.
Did Ramsden's re-analysis show seed oils increase mortality?
In the Sydney Diet Heart Study reanalysis (BMJ, 2013), intervention-group men who replaced saturated fat with omega-6 linoleic acid from safflower oil had higher all-cause mortality (17.6% vs 11.8%, hazard ratio 1.62). In the Minnesota Coronary Experiment reanalysis (BMJ, 2016), serum cholesterol dropped 13.8% in the intervention group, but every 30 mg/dL cholesterol reduction was associated with a 22% higher risk of death across the pooled cohort.
Do other researchers disagree with Ramsden?
Yes. A 2024 review by Jackson, Harris, Belury, Kris-Etherton, and Calder in Lipids in Health and Disease argued that higher blood levels of linoleic acid are associated with a 7% lower risk of total cardiovascular disease and a 35% lower risk of type 2 diabetes. The authors explicitly characterized Ramsden's conclusions as contested.
Is beef tallow high in omega-6?
No. Beef tallow is approximately 50% saturated, 42% monounsaturated, and 4% polyunsaturated according to USDA composition tables. High-linoleic sunflower oil, by contrast, is approximately 66% polyunsaturated, most of that linoleic acid. Cooking in tallow introduces far less linoleic acid to the final product than cooking in refined seed oils.
Does the ratio matter more than total omega-6 intake?
That is part of the disagreement. Simopoulos argues the ratio itself matters because omega-6 and omega-3 compete for the same enzymes and produce different downstream signaling molecules. Harris and colleagues (2024) argue that absolute linoleic acid intake matters more than the ratio, and that higher intakes correlate with better biomarker outcomes. The two views are not fully reconciled in the current literature.
Read Next
- What Happens to Seed Oils When You Fry — The Food Chemistry Explained
- The History of Seed Oils in America — How Vegetable Oils Replaced Traditional Fats
- Tallow Chips vs. Avocado Oil Chips — What the Research Actually Shows
Sources
- Simopoulos AP. An Increase in the Omega-6/Omega-3 Fatty Acid Ratio Increases the Risk for Obesity. Nutrients. 2016 Mar 2;8(3):128. doi: 10.3390/nu8030128. PMID: 26950145. PMC4808858.
- Ramsden CE, Zamora D, Leelarthaepin B, et al. Use of dietary linoleic acid for secondary prevention of coronary heart disease and death: evaluation of recovered data from the Sydney Diet Heart Study and updated meta-analysis. BMJ. 2013;346:e8707. doi: 10.1136/bmj.e8707. PubMed 23386268.
- Ramsden CE, Zamora D, Majchrzak-Hong S, et al. Re-evaluation of the traditional diet-heart hypothesis: analysis of recovered data from Minnesota Coronary Experiment (1968-73). BMJ. 2016;353:i1246. doi: 10.1136/bmj.i1246. PMC4836695.
- Jackson KH, Harris WS, Belury MA, Kris-Etherton PM, Calder PC. Beneficial effects of linoleic acid on cardiometabolic health: an update. Lipids in Health and Disease. 2024 Sep 12;23:296. PMC11391774.
- Koundouros N, Nagiec MJ, Bullen N, et al. Direct sensing of dietary ω-6 linoleic acid through FABP5-mTORC1 signaling. Science. 2025 Mar 14;387(6739):eadm9805. doi: 10.1126/science.adm9805. PubMed 40080571.