What’s Your Inflammation Risk Score?
Find out how much seed oil you’re really eating — and what it’s doing to your body
Most people have no idea that the balance of omega-6 to omega-3 fatty acids in their diet could be silently driving inflammation. The average Western diet delivers an omega-6:omega-3 ratio somewhere between 15:1 and 25:1 — a staggering distance from the 4:1 ratio that nutrition researchers consider healthy. This imbalance is not trivial. Decades of peer-reviewed research link chronically elevated omega-6 intake — driven largely by seed oils such as sunflower, corn, soybean, and vegetable oil — to systemic inflammation, increased cardiovascular disease risk, joint pain, insulin resistance, and impaired immune function. The problem is not fat itself. The problem is ratio. When omega-6 floods the body without adequate omega-3 to balance it, cells produce an excess of pro-inflammatory compounds called eicosanoids. Understanding where you sit on that spectrum is the first step to making meaningful changes.
Calculate Your Personal Inflammation Risk
Answer 10 quick questions about what you eat and how often — it takes under two minutes. The calculator uses USDA FoodData Central omega-6 values and published ratio benchmarks from Simopoulos (2002) to estimate your personal omega-6:omega-3 ratio and flag whether your diet puts you in a low, moderate, or high inflammation risk band. No sign-up required. Nothing is stored. Your data never leaves your device.
What Are Seed Oils?
Seed oils are refined vegetable oils extracted from the seeds of plants — including sunflower, soybean, corn, rapeseed (canola), cottonseed, safflower, and generic “vegetable oil” blends. What they all have in common is a very high concentration of omega-6 polyunsaturated fatty acids (PUFAs), particularly linoleic acid. A single tablespoon of sunflower oil delivers around 8.9 grams of omega-6. Soybean oil contains about 6.9 grams per tablespoon. Corn oil provides roughly 7.3 grams — all far higher than the omega-6 content of butter (0.4 g), olive oil (1.3 g), or avocado oil (1.8 g).
These oils barely existed in the human food supply before the 20th century. Industrial seed oil production scaled dramatically after World War II, coinciding with advice to reduce saturated fat and the rise of processed food manufacturing. By the 1970s and 80s, seed oils had replaced animal fats in homes, restaurants, and food factories across the developed world. Today they are ubiquitous: present in crisps, biscuits, ready meals, salad dressings, hummus, protein bars, takeaway food, and almost every product fried in a commercial kitchen. This rapid dietary shift happened over decades, not centuries — far too fast for human metabolism to adapt.
The scale of exposure is the issue. Linoleic acid (the primary omega-6 in seed oils) now makes up an estimated 8–10% of total calorie intake in Western diets, up from less than 2% in 1900. This matters because omega-6 and omega-3 fatty acids compete for the same enzymes in the body. When omega-6 dominates, it wins — producing inflammatory compounds and crowding out the anti-inflammatory signals that omega-3 provides.
Why the Omega-6:Omega-3 Ratio Matters
The omega-6:omega-3 ratio is one of the most studied — and most overlooked — variables in nutrition science. Research by Dr Artemis Simopoulos, published in the journal Biomedicine & Pharmacotherapy (2002), established the foundational understanding that our hunter-gatherer ancestors evolved on a ratio close to 1:1, and that the human genome is adapted to that balance. A ratio of 4:1 or lower is associated with reduced cardiovascular mortality, lower markers of systemic inflammation, and improved mental health outcomes. A ratio above 15:1 — typical of Western diets — correlates with increased risk of heart disease, colorectal cancer, and inflammatory conditions such as rheumatoid arthritis.
What makes the ratio critical is the competition at the enzymatic level. Omega-6 and omega-3 PUFAs are both converted by the same enzymes (delta-6 desaturase and delta-5 desaturase) into longer-chain fatty acids. When omega-6 overwhelms the system, it monopolises these enzymes, producing arachidonic acid — a precursor to pro-inflammatory prostaglandins and leukotrienes. Omega-3, particularly EPA and DHA from oily fish, competes for the same pathway and produces resolvins and protectins that actively dampen inflammation.
Critically, it is not the absolute amount of omega-6 that determines risk — it is the ratio. You can consume large amounts of omega-6 and remain healthy if you also consume proportionally high omega-3. The problem in the Western diet is that omega-3 intake has not kept pace with the explosion in omega-6 from seed oils. Most people are eating far less oily fish, and far more processed food, than any previous generation. The result is a ratio that chronically tips the body towards inflammation.
How This Calculator Works
The Seed Oil Calculator uses a frequency-weighted model based on published food composition data and dietary ratio benchmarks. Omega-6 values for each food category come from the USDA FoodData Central database — the most comprehensive publicly available nutritional dataset. Ratio targets and risk thresholds are drawn from Simopoulos (2002) and WHO/FAO (2008) dietary fat guidelines, which recommend limiting omega-6 to omega-3 ratios and increasing long-chain omega-3 intake to at least 500 mg per day for adults.
The model multiplies a typical serving omega-6 value by your reported weekly frequency for each food category — cooking oils, sauces and dressings, packaged snacks, takeaway and fast food, and processed meat products. Omega-3 is estimated separately from oily fish consumption and supplement use. The two totals are divided to produce an estimated ratio. The result is a snapshot estimate using population-average portion sizes; individual results will vary based on actual portion sizes, specific brands, and food preparation methods. Use it as a directional guide, not a clinical measurement.
Frequently Asked Questions
What is the ideal omega-6 to omega-3 ratio?
Research by Simopoulos (2002) recommends a ratio of 4:1 or lower. Modern Western diets average 15–25:1. Lower ratios are consistently associated with reduced inflammation, better cardiovascular health, and improved mental wellbeing. A ratio below 4:1 has been shown to reduce all-cause cardiovascular mortality by 70% in secondary prevention trials.
Which oils are highest in omega-6?
Sunflower, corn, soybean, and standard vegetable oils contain between 7 and 11 grams of omega-6 per tablespoon — making them the largest single contributors to omega-6 overload in the Western diet. Olive oil contains around 1.3 grams per tablespoon, avocado oil approximately 1.8 grams, butter roughly 0.4 grams, and ghee is similar to butter. Coconut oil contains virtually no polyunsaturated fat at all.
Can seed oils cause inflammation?
High omega-6 intake relative to omega-3 promotes the production of pro-inflammatory compounds (eicosanoids, prostaglandins, leukotrienes) via the arachidonic acid pathway. Research consistently links a high omega-6:omega-3 ratio to elevated inflammatory biomarkers including CRP, IL-6, and TNF-alpha, and to increased risk of chronic inflammatory diseases. This does not mean seed oils are toxic in small amounts — the issue is the ratio, not any inherent toxicity.
How do I reduce my seed oil intake?
Switch your primary cooking oil to extra-virgin olive oil or avocado oil, which are low in omega-6 and stable at cooking temperatures. Avoid packaged snacks, crisps, and biscuits — almost all use seed oils. Be wary of bottled salad dressings, mayonnaise, and sauces. Reduce takeaway and fast food, where seed oils are universal. Increase oily fish (salmon, mackerel, sardines) to two portions per week or more. Consider an EPA/DHA omega-3 supplement if your fish intake is low.