How Much Are Seed Oils Affecting Your Health?
Find out your personal inflammation risk in under 60 seconds
Most people have no idea that the cooking oils and packaged foods they eat every day may be quietly disrupting their body’s inflammatory balance. Answer 6 simple questions about your diet and get an instant, personalised estimate of your omega-6:omega-3 ratio — plus a targeted action plan to improve it.
Calculate Your Inflammation Risk
Answer 6 questions about what you eat. No sign-up required. Nothing is stored. Your data never leaves your device.
What Is Omega-6 vs Omega-3 Balance?
Omega-6 and omega-3 are both polyunsaturated fatty acids your body needs — but they have opposite effects on inflammation. Omega-6 fats, found in high concentrations in seed oils like sunflower, corn, and soybean oil, promote the production of pro-inflammatory compounds. Omega-3 fats, found in oily fish, act as a natural counterbalance — producing anti-inflammatory signals that help regulate the immune response.
The key number is the ratio between them. Research by Dr Artemis Simopoulos (published in Biomedicine & Pharmacotherapy, 2002) established that our ancestral diet maintained a ratio of approximately 1:1 to 4:1. A ratio at or below 4:1 is associated with significantly reduced risk of cardiovascular disease, inflammatory conditions, and all-cause mortality.
The average Western diet today sits between 15:1 and 25:1 — reflecting a dramatic shift driven almost entirely by the rise of cheap seed oils in cooking and food manufacturing. The human body has not adapted to this change; it happened too fast.
Why Modern Diets Are Out of Balance
Two changes explain almost all of the omega imbalance in Western diets: the rise of seed oils, and the decline of oily fish consumption.
Seed oils — sunflower, vegetable, corn, soybean, rapeseed — are now the dominant cooking fat in restaurants, food manufacturing, and many homes. They are cheap, shelf-stable, and high in linoleic acid (omega-6). A single tablespoon of sunflower oil delivers around 9 grams of omega-6. These oils appear in crisps, crackers, biscuits, ready meals, salad dressings, mayonnaise, takeaway food, and almost everything fried in a commercial kitchen.
At the same time, oily fish consumption — the primary dietary source of EPA and DHA omega-3 — has declined significantly. The result is a diet that floods the body with omega-6 while providing little omega-3 to balance it. The ratio tips, inflammatory pathways are chronically activated, and over years, this may contribute to conditions ranging from joint pain and fatigue to more serious cardiovascular and metabolic disease.
How This Calculator Works
The Seed Oil Inflammation Risk Calculator estimates your daily omega-6 and omega-3 intake from 6 questions about your diet. The three omega-6 drivers are: your main cooking fat, how often you eat takeaway or fast food, and how much packaged or processed food you consume. The three omega-3 factors are: oily fish frequency, omega-3 supplement use, and nuts and seeds intake.
Omega-6 values come from USDA FoodData Central — the most comprehensive public food composition database in the world. Risk thresholds are drawn from Simopoulos (2002) and WHO/FAO (2008) dietary guidelines. The result is an estimated ratio, a risk tier (Optimal / Moderate / High / Very High), and a personalised fix plan showing the top 3 changes that would have the greatest impact on your specific answers.
This tool provides estimates, not clinical measurements. Individual results vary based on actual portion sizes, food brands, and metabolism. Use it as a directional guide — and consult a dietitian if you have health concerns.
Frequently Asked Questions
What is the ideal omega-6 to omega-3 ratio?
Research recommends a ratio of 4:1 or lower (Simopoulos, 2002). Western diets average 15–25:1. A ratio below 4:1 is associated with significantly reduced cardiovascular mortality and lower levels of inflammatory biomarkers. Getting below 10:1 is a meaningful first milestone for most people.
Which cooking oils are highest in omega-6?
Sunflower, corn, soybean, and generic "vegetable" oils contain between 7 and 11 grams of omega-6 per tablespoon. Rapeseed/canola oil is lower at around 2.9g. Olive oil contains roughly 1.3g per tablespoon. Butter and ghee contain approximately 0.4g. Avocado oil is around 1.8g. Coconut oil contains virtually no polyunsaturated fat.
Can seed oils cause inflammation?
A high omega-6:omega-3 ratio — driven largely by seed oil consumption — is associated with increased production of pro-inflammatory compounds via the arachidonic acid pathway. Research consistently links high ratios to elevated inflammatory markers (CRP, IL-6) and increased risk of chronic inflammatory disease. The issue is the ratio relative to omega-3, not any inherent toxicity of seed oils in small amounts.
What is the fastest way to improve my omega ratio?
The two highest-impact changes are: (1) switch your primary cooking oil from seed oils to extra virgin olive oil — this alone can save 8–10g of omega-6 per day, and (2) eat oily fish (salmon, mackerel, sardines) 2–3 times per week or take a daily omega-3 supplement providing 1000mg+ EPA/DHA. These two changes combined can move many people from a 20:1 ratio to under 10:1.