Seed oils like canola, soybean, sunflower, and corn oil are high in omega-6 fats, especially linoleic acid. The popular worry is that omega-6 fats are inflammatory and drive disease. But controlled human studies tell a more nuanced story: replacing saturated fat (like butter) with these unsaturated oils generally lowers LDL cholesterol and is linked to lower heart-disease risk. Reviews of the evidence have not found that linoleic acid raises inflammation markers in people the way lab theories suggested.
That said, the viral posts aren't inventing everything — there are real nuances worth knowing. First, heat and reuse: any oil repeatedly heated to frying temperatures (think restaurant fryers) breaks down and forms oxidation byproducts you don't want much of — that's a frying problem, not a canola-in-your-kitchen problem. Second, refining: most commercial seed oils are extracted and refined industrially; the finished oil is considered safe, but if that process bothers you, cold-pressed and olive oils are easy swaps. Third, balance: omega-6 isn't harmful in human trials, but most of us eat far more of it than omega-3 — the evidence points toward adding omega-3s (fish, walnuts, flax), not fearing omega-6.
The biggest truth in the debate: where seed oils actually show up in your diet is fried and ultra-processed food. If you cut back on those, your seed-oil intake drops on its own — and that's a change everyone agrees is healthy. Cooking at home with these oils, or with olive oil, is not the health threat social media claims.
And if you'd still rather avoid them: that's exactly what your avoid list is for. Add refined seed oils and Rootd will flag them in every scan — your call, your scoring.