Sorry, but WHAT? Any citation to backup your claim? Please and thank you.

It's a fairly new hypothesis, comming out of recognition that plant oils with exception of olive oil, maybe some others, are fairly new thing in human diet and their usage (as replacement for animal fats) kind of correlates with raise of modern diseases and obesity.

There are also some molecular pathways that might be triggered by substances in plant oils but there's not much systemic research into this yet.

But I think it's all plausible. There's really no harm in restricting yourself to just olive oil out of all extracted plant oils. And since it cuts out most processed foods available on the market it might help you on other ways.

You can still eat plant oils with the whole plants they come from becuse you won't be able to eat even remotely close quantities of them this way.

Omega-6 vegetable oils as a driver of coronary heart disease: the oxidized linoleic acid hypothesis https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6196963/

I like that one and it has good references. I could find more (Crisco and trans fats... duh) but I mean come on...

Seed oils like canola oil are manufactured and did not exist before 1900. They're totally unnatural and heavily manufactured with solvents, preservatives, high heats, deadorizers, coloring. Seed oils go rancid so fast without chemical processing and preservatives before they're bottled.

Do you want to cook with stable saturated fats in ghee that has been used for generations after generations - Or manufactured seed oil, first sold to the public as Crisco by P&G? Seed oils do not occur in nature, they are manufactured. Do you want to shove it down your gut until good enough studies prove it's safe or unsafe? Not me!

Vegetable oils. Good history here: https://www.youtube.com/watch?v=4Uqj35nHB0g&t=749s

This is interesting but a huge problem with dietary guidance is that the body and its processes are hugely complex and understanding evolves over time. A year after that was published the American Heart Association gives contradictory evidence. One could trivially spend one's entire life chasing emerging science and receive for your efforts zero benefit while people trivially ignore obvious and clear guidance on basic matters like diet, sleep, and exercise that is unambiguous.

https://www.health.harvard.edu/newsletter_article/no-need-to...