A popular form of vegetable oil, soybean oil is extracted from the seeds of the soybean. There has been much hype about it being a healthful oil, but there’s more to soybean oil than what’s advertised on product labels. It could be very problematic to use in cooking, due to factors such as hydrogenation and the presence of genetically engineered varieties. Get the lowdown on this polyunsaturated oil – and why it is one of the worst oils for cooking.