Robin Cook's "Coma":

This was a novel-turned-movie about a hospital that put people into comas, and in turn sold their body parts on the black market. There was a scene in the book where the story's hero female doctor (pictured above) bought a tuna fish sandwich from a vending machine. Is that nasty or what???
The author was a man, but until I did the image search for this post just now, I assumed the author was a woman.