Talking about expired pill or medicine. I recall a friend that didn't listen to me. It seem that she not only loves to eat expired can food but also expired medicine. Not that she bought expired one to eat but she waited long time before finishing them.
Personally, I don't agree taking any expired product or medicine. Health does matter and I don't want to risk my life for it as if anything bad happened to me. Not me alone that suffer but family and friends too.
Tell me how do you talk your friend about not to take such expired medicine or products? I need all idea that you have in mind.
I don't think taking expired medicine has to be of any danger, even but I would not do it myself. Of course it can depend on what kind of medicin it is. I know that they sometimes send expired medicin to the third world.

And with expired food... Well, it is up to each of us to use common sense. Food can be edible even but the best before date has expired. You will find out by smelling or tasting it.