I've been neglecting my "research into the obvious" lately, so here's a good one:
In a study of nearly 3,000 healthy British adults, lead by Dr. Andrew Steptoe of University College London, found that those who reported upbeat moods had lower levels of cortisol -- a "stress" hormone that, when chronically elevated, may contribute to high blood pressure, abdominal obesity and dampened immune function, among other problems.
And if you're not upbeat, don't stress out over it, for goodness sake; that will just make it worse.
