First off Canola oil does not come from the Canola bean. It come from a genetically bred line of Rapeseed.

"Canola was originally a trademark name of the Rapeseed Association of Canada, and the name was a condensation of "Can" from Canada and "ola" from other vegetable oils like Mazola, but is now a generic term for edible varieties of rapeseed oil in North America and Australia."

Canola oil is one of the most widely consumed vegetable oils, yet little is known about its health effects. Now, a study links canola oil consumption in the diet with worsened memory, worsened learning ability and weight gain in mice which model Alzheimer's disease. It's the first study to suggest that canola oil is more harmful than healthful for the brain.