It’s easy to only ever quote the other side in order to knock it down. So let’s do the opposite. Here are the strongest arguments that seed oils are fine, laid out as fairly as we can manage — because if our case can’t survive the best version of theirs, it isn’t much of a case.
“The trials show they lower cholesterol”
Their point: swapping saturated fat for polyunsaturated oils reliably lowers LDL cholesterol in controlled trials, and some analyses tie that to fewer heart events. Fair. Our response: the LDL drop is real — but whether it actually means you live longer is far shakier. Several of those same trials found no reduction in total deaths, and a couple found the opposite. Cholesterol is a marker on a dashboard, not the destination.
“The ‘toxic’ compounds are at tiny doses”
Their point: yes, oxidation makes reactive molecules, but the amounts in normally cooked food are small and your body has defenses against them. Fair, up to a point. Our response: the word “small” is doing heavy lifting when these oils are in nearly everything, eaten every day, for a lifetime, and stored in your tissues along the way. A tiny dose in one meal and a steady dose over forty years are not the same question.
“It’s the junk food, not the oil”
Their point: seed oils mostly turn up inside ultra-processed food, so maybe the processing is the culprit, not the oil. Genuinely fair — and honestly hard to fully untangle. Our response: true, and we’d never claim the oil is the only variable. But it’s the common thread running through most of that food, and there’s a plausible mechanism for why it in particular matters. That’s enough to treat it as a prime suspect while the science works out how much of the blame is its.
Where that honestly leaves us
Somewhere less certain than either camp’s loudest voices would like. The evidence that these oils are actively harmful in the amounts we now eat is suggestive and mechanistically plausible — not airtight. The evidence that they’re perfectly safe is weaker than it’s usually sold as. Given that genuine uncertainty, cutting the most processed, most oxidation-prone fats and eating closer to what humans ate for thousands of years is a low-risk bet, not a leap of faith.
That’s the honest place to stand: take the strongest opposing arguments seriously, hold your own view with some humility, and make a sensible call while the evidence is still coming in. Anyone selling you total certainty — in either direction — is selling something.
A fair steelman of the pro-seed-oil arguments and honest responses — landing on: the harm case isn’t airtight, the safety case is weaker than sold, and cutting them is a low-risk bet.
- Seedoil reference library — “ProSeedOils” collection (industry-aligned / defending studies, Zotero)
- r/StopEatingSeedOils Wiki: “Apologists & Defenders”
- Ramsden C. et al., re-evaluation of the Sydney Diet Heart Study — BMJ, 2013 · link