TLDR (or at least what I took from it): Too much adversity produces stress that is bad for the body in that it ages your immune system much faster than it should. Sounds plausible.
It is slightly more than adversity, as anyone can lose someone important or their job, suffer from brain trauma, etc. Upward mobility implies understanding and navigating through different sets of social rules and this can be extremely stressful and implies what sociologists call anomie. The sociological explanation of this phenomenon is almost a hundred years old. You can read it here: Merton, Robert K. (October 193…
".. characterized by a rapid change of the standards or values of societies (often erroneously referred to as normlessness), and an associated feeling of alienation and purposelessness. He believed that anomie is common when the surrounding society has undergone significant changes in its economic fortunes, whether for better or for worse and, more generally, when there is a significant discrepancy between the ideological theories and values commonly professed and what was actually achievable in everyday life."
This can certainly be said to describe how many are feeling with the current election outcome. Thanks for bringing this up.