partially hydrogenated fat.... The process makes fat solid at room temperature.... it also changes the molecular structure in a bad way for health.
so any vegitable fat that stays pretty much stable and not melting at room temperature is a bad guy....
The only one that is good is Coconut oil...
the following is from
http://www.coconutresearchcenter.org/
Coconut oil is composed predominately of
medium-chain fatty acids (
MCFA), also known as
medium-chain triglycerides (MCT). The
vast majority of fats and oils in our diets, whether they are saturated or unsaturated or come from animals or plants, are composed of
long-chain fatty acids (
LCFA).
coconut oil melts at 76 degrees farenheit
this article explains the history and what they are
https://en.wikipedia.org/wiki/Trans_fat
deb