Our problem, as the stupid humans that we are, is that we mis-categorize things (usually due to our lack of understanding, and some politicians hands being greased)
So much of our neurological structure is made up of fats and oils.
The problem is, the body will use good fats and bad fats.
And just like putting diesel in a gasoline car will make it die a horrible death,
putting seed based oils in a human body produces various breakdowns.