The vibe
You’ve seen the TikToks. Beef tallow good, canola oil bad, your inflammation is the sunflower’s fault. The truth is more boring: seed oils are mostly fine, but the foods they live inside are mostly not.
The actual chemistry
Seed oils are high in linoleic acid, an omega-6 fat. Modern diets skew omega-6 high vs. omega-3, which can nudge inflammation pathways. ‘Nudge,’ not ‘ignite.’ Whole foods cooked in seed oil still beat ultra-processed snacks fried in any fat.
What the studies say
Meta-analyses on linoleic acid and heart disease keep finding either a small benefit or no effect. The hot takes ride on cherry-picked rat studies and one 1960s trial that’s been re-analyzed to death.
So what do I do
Cook with whatever you want. The action that actually changes your health is less ultra-processed food, more plants, sleep more than five hours. Seed oils are downstream of that, not upstream.