As our understanding of the nervous system expanding we are really beginning to understand how devastating the effects of stress can be on one's body.
Our systems evolved in order to allow us to respond to immediate danger but with the further development of our brains we have acquired the ability to fire our Stress-Response (Flight of Flight) just by thinking about things that might happen to us in the future.
This is a very good of a documentary by National Geographic on Stress.
If you get a chance you should read any books that you can get your hands on by Robert Sapolsky.
The book that I am currently reading, "Why Zebras Don't Get Ulcers".
Regurative Mind... I found this clip on youtube while I looking for some clips on Elkhonon Goldberg (I wanted to see if there was anything explaining his books.) I don't normally post stuff by this guy because the angle he records his clips normally freak me out. (Makes it look like he has a freakishly large head.) But he does make some good points about the 'regurative mind'. I've found this incredibly prevalent in NLP and Hypnosis, not to mention in Academia.
And I do think that everyone is suspectible to this and in a way that is why it's so important for people to do research outside their chosen field in order to expand their insights.