I often try to focus on recent studies, since science progresses so quickly.
And when it comes to stress, there have been a lot of interesting studies over the past few years.
However, we went back almost 15 years for this one:
Are Vacations Good for Your Health? The 9-Year Mortality Experience After the Multiple Risk Factor Intervention Trial
As you can guess from the title, the study examined the association between vacations and health. Vacations are obviously not an exact measure of stress or the lack thereof.
The study followed over 12,000 men for about 9 years, but it was, nonetheless, only an observational study, meaning that we can only draw hypotheses from it.
However, the results were astounding enough to warrant some discussion.