When canola oil is heated to high temperatures (think: frying), especially for a long time, linoleic acid (a healthy fatty acid also in corn, safflower and soybean oils) gets broken down into a compound called HNE, which has been linked to heart and liver disease and neurological problems. read more
But canola oil can also be a proactively good ingredient for your heart, not simply a replacement for unhealthier ingredients. In 2006, the U.S. Food and Drug Administration (FDA) issued what is called a "qualified health claim," which states that the unsaturated fat in canola oil may help reduce heart disease by lowering both LDL (bad) cholesterol and total cholesterol. read more