this could explain a LOT about the JW maladies.....
from an article on "7 thoughts that are bad for you"
http://www.livescience.com/health/090911-7-bad-thoughts-1.html
Gloom and Doom
The gloomy, inhibited person is not just at a disadvantage socially, but also physically.
A preliminary study of more than 180 patients suffering from peripheral arterial disease (plaque buildup in the arteries) showed participants with so-called type D, or distressed, personality, had an increased odds of dying sooner than other people. Type-D people are more likely to experience negative emotions while at the same time hold in their feelings.
The researchers, who detail their work in the August issue of the journal Archives of Surgery, suggest the personality type is linked with the body's immune system as well as stress response system.