gotcha my bad, not yours...
no I dont think they can just will cancer, or aids, or something similar away.
I guess to be blunt I dont believe the hype. I think the terminology of mental illness is abused and overused to give people a reason to be lazy and not try to be better people.
I do not believe that depression is a mental illness, I think its someone being to weak minded to break themselves out of a funk. I think that horrible things can happen to people that break their spirit, but once again I do not consider that a mental illness, and thats when family and friends need to step in and support a person... not drugs, not doctors, and not my tax dollars.
I have a cousin who lost his wife unexpectedly to a brain anuerism(spelling i know..) hes upset, its a couple months later and he is getting better, now is that grief, or depression, or both?
I think its natural to be upset, and depressed, and I also think its natural to find what is important and fight back from that and move forward.
But I do not think its a mental illness.
does that clarify my answer for you?