Poop study

Factual Questions
1

I was wondering if a serious study has ever been made to use poop as some kind of barometer of emotional states. My diet has changed very little over the years but I can draw a strong correlation to periods in my life and the state of my poop durring those same periods. I have also found making concious adjustments in my attitude for one reason or another seems to reflected in changes to my poop.

  Could this be a viable worthwhile area of study or not?
2

Mentioned here:

In this nurse’s textbook:

And lab manual:

and suggested, ideally for OP, as a project for genetic manipulation, here:

3

Our family found this article helpful and it has links to various studies.