A chemist on Less Wrong had a look at what happens when you heat seed oils:
https://www.lesswrong.com/posts/TNHfhG2EWyGPLeEyd/so-what-s-up-with-pufas-chemically
Which is to say, they turn into trans-fats, but not as much as MUFAs turn into trans-fats. Why? Because they’re too busy turning into peroxides! Lovely heart-healthy peroxides. He seems to have missed them polymerising and turning into varnish, which I think also happens when they oxidise, but I am no chemist.
And u/exfatloss wrote an entertaining rant about dynomight’s seed oil article:
https://www.exfatloss.com/p/a-reply-to-dynomights-thoughts-on
I weirdly find myself agreeing with both dynomight and u/exfatloss here.
Dynomight is right. Nutrition “science” thinks that seed oils are great. “No evidence” that they cause any harm at all, say “scientists”.
And u/exfatloss is right. There’s an absolute bucket of evidence that seed oils might be very bad. Certainly something is very wrong.
How to square this circle?
It’s because nutrition “scientists” don’t know what they’re talking about.
When medical types say that there’s “no evidence”, invariably they mean that there’s lots and lots of evidence but that they haven’t done any studies.
Often that’s because the studies would be really hard to do. Nutrition “science” is famously really difficult, and you can find endless studies supporting any position you like, it is all a matter of interpretation.
That doesn’t have any implications. The fact that your pretend “science” can’t tell its arse from its elbow means you have nothing to say, not that you are wise.
So shut up. You fuckers.
> So shut up. You fuckers.
And I thought I was going overboard in that post :D