<<Disclaimer: Verify this information before applying it to your situation.>> About two years ago I read in a textbook on nutrition (I forgot which) that canola is chemically treated in order to extract the oil, and that some individuals cannot tolerate it because of the chemicals, not the canola itself. That might explain why some people react to it, some don't, and some only react to certain brands. -Sylvia in Ithaca, NY