Vegetable Oil
Polyunsaturated oils, which include vegetable oils like corn, soy, safflower and canola , are the worst oils you can eat, as generally Americans’ intake of omega-6 fat from these vegetable oils is far too high.
Experts looking at the dietary ratio of omega-6 to omega-3 fatty acids, which are the healthy fats found in fish oil and cod liver oil , suggest that in early human history the ratio was about 1:1. Currently most Americans eat a dietary ratio that falls between 20:1 and 50:1. The optimal ratio is most likely closer to the original ratio of 1:1. For most of us this means greatly reducing the omega-6 fatty acids we consume and increasing the amount of omega-3 fatty acids.