Due to its chemical structures containing multiple double bonds, PUFAs are easily oxidized. Once you purchase vegetable or corn oil, cooking with it can make even it more rancid. When in our bodies, oxidized PUFA can be dangerous. Specifically, a primary cause in the development of heart disease the oxidative damage to fat-containing low-density lipoprotein particles.
One example of oxidation is by heating cooking oil many times or by reusing it. One study showed that when oil is heated by a bunch of times, it causes inflammation when consumed. Even though inflammation can help you fight infections and heal injuries, this is a big factor in inflammatory diseases which happen to be some of the most common diseases of today.
Stay away from processed and industrial oils like “vegetable oil”, soybean oil, canola oil, etc., and anything made with them.
Stick with Extra Virgin Olive Oil, Coconut Oil, Butter, and things like Beef Tallow.lindsayfuce What are PUFAs and Why Can They Be Dangerous?