http://articles.mercola.com/sites/artic ... ition.aspx
I've done it only 2 times, but I do prefer squatting. I think this statement is true for me:A sitting posture may increase diverticulosis of the colon. The magnitude of straining during defecation is at least three times greater than with the squatting posture.[11]
...
Denis Burkitt conjectured that the squatting defecating posture can prevent cancer, especially colorectal cancer.[12]
http://en.wikipedia.org/wiki/Human_defecation_postures
"Makes elimination faster, easier and more complete."