Interesting, thanks. Know of where to read the random trial results? Did they clear the chemically separated/deodorized oils from suspicion? While I err on the side of avoiding them, I don’t have too strong an opinion on this, because like I said, not an expert.
Why are fried foods bad for you? It’s commonly held wisdom, but I’m curious what the mechanics are, to see if there’s a way to mitigate it. Is it something other than the oxidation products that I mentioned? And if it is those, would a more stable fat not fare better? I guess there’s the changes to the food from the high temps in both cases.
There are a handful of studies referenced by this review that look at health impacts of vegetable oils: https://pmc.ncbi.nlm.nih.gov/articles/PMC11600290/
For fried food, I'd worry way more about the raw caloric density and the overeating that can be induced by hyperpalatable foods[1] than oxidation.
[1]: https://en.wikipedia.org/wiki/Hyperpalatable_food