According to the show on PBS* right now, there are monkeys in the wild that have DIED from stress-related maladies that, pathologically, are the same as stress-related maladies that affect people. I feel the need to point out that i, personally, have been feeling less and less stressful recently, and i have to tell you, it feels pretty good. Buck up, monkeys! And people!
*link is to PBS info, there isn't a link to watch the show :-(