Because vegetable oils are rich in omega 6 acids, they're contributing to a discount in crucial omega three fatty acids in the mind by changing them, he believes. Concerns over toxic chemical substances in heated oils are backed up by separate research from an Oxford professor, who claims that the fatty acids in vegetable oils are contributing to different well being problems. Because cooked fat comprise extra free fatty acids, it’s best to not reuse cooking oils as the smoke point will be lower and more volatile compounds might be created with every use.