> ‘They started asking people, “how much stress have you experienced in the last year?”’ The doctors also probed whether participants believed that stress was bad for their health – and then looked at the records to see who died. ‘People who experienced a lot of stress in the previous year had a 43 per cent increased risk of dying. But,’ McGonigal continues, ‘that was ONLY true for the people who also believed stress was also harmful for your health. People who experienced a lot of stress but did not view stress as harmful were no more likely to die – in fact, they had the lowest risk of dying of anyone in the study, including people who had very little stress.’

I'm not sure the causation goes in that direction. Couldn't it also be that those who take damage from stress feel that stress is bad for them, and those who aren't affected by stress negatively feel that it's good for them? To throw a silly example... Vampires believe that sun is harmful, humans believe a bit of sun is good for them. But believing won't make a difference for the vampire.