Regarding the hate on Canola Oil, I have found the following:
Refining/Bleaching/Deodorizing of rapeseed causes oxidation of the n-3 fatty acid content (Apparently mostly the last one)
Canola oil gets further oxidized during heat processing (To extract oil from the rapeseeds)
There is a high Erucic acid content in unrefined rapeseeds (bad), but canola is also called LEAR oil (Low-erucic acid Rapeseed) oil, as this part has been processed out.
I was also reading up on Nervonic acid, which is apparently a fatty acid found in high concentrations in the brain. Canola was the most significant natural source of this oil.
My question is, are the ‘evils’ of canola oil solely due to processing and erucic acid? I cannot find anything to imply that erucic acid is a concern anymore, and if one could find cold-pressed canola oil then most the harm would be negated, and the Nervonic acid accrued without harm.
Also, I would imagine with an n-3 content of 10% (from estimates I have read), the deodorization process can’t oxidize too much, especially since there are probably anti-oxidants in the oil to negate this.