In a recent animal study, it was found that diets that included canola oil rather than corn oil had less of a chance of growing colon tumors.
One of the reasons that gives canola the edge is the high amount of omega-3 fatty acids, where corn oil is higher in omega-6 fatty acids. In the animals tested, researchers charted the size and number of colon tumors and tested their blood for its fatty acid amount. When comparing animals whose diets contained corn oil verses canola oil, the animals whose diet included canola oil had fewer tumors and much smaller tumors on average.
While researchers will next attempt this same study on humans, researchers and nutritionists alike agree that only good can come from including more omega-3 fatty acids in your diet.