Sounds healthy, doesn’t it?
Canola oil is a triumph of marketing over facts. It’s actually
(from the rapeseed plant), but was renamed for obvious reasons.
Rapeseed oil is pretty disgusting stuff. In its natural state, it’s an ugly
greenish color. It also has a high concentration of erucic acid, which
may cause heart damage.
To turn it into something marketable, manufacturers remove the
erucic acid. Bleach it. Deodorize it. And degum the oil with various
chemicals, including hexane, a chemical solvent.