Vegetable oils are usually processed at high heats. The process includes adding the poison solvent hexane, which also binds with the pesticides in the oil seeds. The heat makes the unsaturated fats oxidize, making them poison. To compensate for the lost storability, the chemical compounds BHT and BHA, said to cause cancer and brain damage, are added. Margarines are similar, stuffed with trans fat, which is toxic, but which the body treats as regular fat cells. Replace both with cold-pressed vegetable oil or coconut oil.
Disturbing...many food contains this type of ingredient. Better check that Twinkie roll I bought just now.