Canola oil, rice bran oil, and grapeseed oil---commonly considered to be healthy, are, in fact, all highly processed oils. Processing is necessary to extract the oil from rapeseed (canola), rice bran, and grape seeds, and may include extraction with heat and solvents, as well as chemical bleaching, degumming, and deodorizing. Because the raw oils have monounsaturated and polyunsatured components, when exposed to heat, they readily oxidize. Oxidized oils are toxic and highly inflammatory.
