Most dont occur in any measurable amount in nature so its consuming a very unatural concentration of it. And most are extacted using benzene or something similarly toxic. I would argue peanut oil if cold extracted isnt the worst as the fat does exist naturally in a measurable amount in the peanut 

 peanut oil is sooo good for fries and bacalaitos 

 Yea I def agree. Especially for fries. Its one of the few non-animal fats I dont mind consuming. Doesnt require as much processing to extract and its naturally stable even at high temps.