burning food is bad ... espesially fats and oils....
you never want to smoke an oil....diffrent oil's smoke at diffrent tempratures....
same goes for fat basicly..... if you burn it, it alters the structure.
Burning is not good .....
I've heard even burning starches like hashbrowns can be bad and creates a carcenogen.
But who wants a well done steak anyway? When I eat red meat I like it with a little red left in it.