Char on a steak contains heterocyclic amines and polycyclic aromatic hydrocarbons. These compounds, in extremely high doses, in isolated laboratory conditions, in rats, have shown carcinogenic effects.
The doses used in those studies, scaled to human equivalents, would require you to consume the charred outer crust of approximately several thousand steaks per day for the rest of your life.
Humans have been cooking meat over open fire for somewhere between two hundred thousand and a million years. The crust on a roasted joint, the bark on a brisket, the blackened edges of a chop pulled from the embers: this is the food our species was built around.
If burnt-edge beef caused cancer at the rate the headlines imply, we would not be here to read the headlines.
Eat the steak.
Enjoy the crust.
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