The deceptive thing about vegetable oils is that people immediately assume they're the healthier option. In actual fact, these oils are hydrogenated and the vegetables involved have had their oils stripped from them chemically. On top of that, the oils are then dyed and deodorized to make them look and smell more palatable. They are also extremely high in omega-6 fatty acids, which are fine in small amounts, but can be deadly if you consume too much.
Excess omega-6 fatty acids in the diet have been linked to heart disease, arthritis, respiratory problems, depression, and cancer, which we think is a pretty compelling reason to stay away! The best way to offset your omega-6 intake is to always balance it with omega-3 fatty acids. And definitely avoid products such as hydrogenated oils, which don't offer any omega-3 benefits.