I heard somewhere that modern hydrogenated fats and oils in margarine
are chemically so similar to plastic that the difference is one
molecule, which is why those kinds of oils are so hard to clean out of
plastic containers especially after heating: they bond chemically with
the container.

Butter has lots of cholestrol but at least it isn't plastic! I sometimes
make my own from heavy whipping cream, shaken in a jar. Freshest
unsalted butter you can have!

phbp