>>Like cottonseed oil? This is the one that really gets me. It's a byproduct
>>of a crop on which pesticides are heavily used. Never were cottonseeds a
>food.

Cottonseed oil is also contaminated with gossypol, a toxin which,
among other things, has a profound anti-fertility effect.  Refinement
removes *most* gossypol...

>>
>>Like potato chips and the like? What is in deep fat fryers?
>
>Ask at McDonald's? At least they change it now and then.

Ironic that Micky Dee's changed from tallow to hydrogenated veg oil
based on public pressure.  Now we know better about TFAs etc... but
will they change back to tallow?  Their own food chemists & tasters
resisted the original change -- people preferred the animal fat taste.