“Seed oils are toxic and cause inflammation.”
Strong confidence because systematic reviews of human trials do not show that linoleic-acid-rich seed oils increase common inflammatory markers. Replacing saturated fats such as butter or lard with unsaturated oils generally improves LDL cholesterol and can support heart health.
Seed oils are not toxic, and human research does not show that they cause chronic inflammation. They can be used as part of a healthy diet and may be a better heart-health choice than butter, lard or beef tallow.
Seed oils often appear in fried snacks and highly processed foods, but the oil is not automatically the reason those foods may be easy to overeat. Calories, portions, fiber, sodium and the overall dietary pattern also matter.
Replacing unsaturated seed oils with butter or tallow is not an evidence-based health upgrade. Replacing either with a generally balanced eating pattern matters more.
Can seed oils support heart health?
Yes. Seed oils provide unsaturated fats and are practical for cooking. They can help replace fats that are higher in saturated fat.
You do not need to avoid canola, soybean, sunflower or similar oils. Choose cooking fats based on taste, use and your overall diet, not internet fear.
Keep using the cooking oil that works for you. Put more attention on the foods and portions around it than on eliminating seed oils.
Similar claims on Seed oils
Don't waste worry on seed oils. If you want to eat healthier, the real win is cooking more whole foods at home - not swapping canola for butter or tallow, which the evidence doesn't support as an upgrade.