My mother believes in using corn oil, I think its an ethnic thing.(I do keep canola, olive, peanut and grapeseed oil in the house, but its hidden.;-)
Corn oil is also a omega-6 polysauturate, an unsaturated fat which is not the healthiest oil available; you should substitute a monounsaturated fat, like olive oil, for sauteeing or salads. If your wife is baking with it, applesauce or yoghurt is a good substitute for some of the corn oil, or maybe shed try canola. Canola oil is a very healthy unsaturated fat, heart healthy and a good source of omega3-omega-6 fatty acids.
Corn oil is probably to her taste, but a good balance of poly- and mono-unsaturated fats is important in the diet. If she cooks with it frequently and just cant stop, taking fish oil in a cap will give you a healthier balance of omega3-omega-6 fats.people should buy it to stay healthy.