Hi everybody,
I've just noticed that Ellen Langer (Harvard Psych. Dept) and her colleague have rather strong evidence that just making decisions has a very substantial positive effect on health from a study dating from the 1970s:
Ellen Langer: Read Chapter One
Nursing home residents who made more decisions were much healthier after the study and less than half as many died as in the control group!
I think this may be related to what's happening in this thread!
Here's a recent interview which also refers to "the plant study":
http://www.npr.org/2012/08/02/157809...to-beat-stress
- vital