The Curse of Vegetable Seed Oils : Canola oil, grapeseed oil, and soybean oil. Their names sound healthy, but they are 'toxic substances' that have undergone extensive chemical processing. Excessive omega-6 fatty acids break down our body's defenses, cause chronic inflammation, and destroy mitochondria, the powerhouses of cells. When mitochondria are damaged, cells mutate into an abnormal state where they obtain energy by fermenting sugars instead of oxygen. This is the very beginning of cancer cells.