Oils that are refined have been heat treated and de-odorised. That
sort of
processing destroys any goodness in the oil and turns them into
trans-fatty
acids. Those trans-fatty acids  are particularly bad for us but they
never
appear on labels.

I don't think any commercial oils are good for us - exect Virgin Olive
oil
which is not refined or heat treated in any way. "Cold pressed" is a
bit
meaningless because even if an oil has been cold cold pressed, it
might
still have been de-ordorised and bleached which involves high
temperatures.
It's only the Virgin Olive oil that hasn't had that treatment
therefore is
OK.

Udo Erasmus' book is excellent at describing everything there is to
know
about fats and oils.

A