That lines up with what Brian Peskin's research on Essential Fatty Acids (EFAs) have shown; Oils high in Omega-3 and Omega-6 EFAs are generally oxidized during

That lines up with what Brian Peskin's research on Essential Fatty Acids (EFAs) have shown; Oils high in Omega-3 and Omega-6 EFAs are generally oxidized during processing (which usually involves high heat), resulting in free-radical inducing oil. It appears only cold pressed vegetable/seed oils are safe for human consumption. Oils high in Omega-9 (Olive oil) or Saturated fats like Coconut and Animal fats do not suffer from this issue, as they are more resilient to heat and oxidation. Fish oil supplements are also almost always rancid/oxidized, making them a common source of free-radicals.