I used to know some one who was all ways moaning at me to eat properly. He would say " if you don't eat properly you don't poo, if you don't poo you'll die" I always put it down to him being Iranian and it was what his mum had frightened him with to get him to eat up his dinners. I know find out thirty years later he was right not pooing can at its most extreme kill you. The internet is littered with tales of people straining to go and causing a heart attack.
I will finish tomorrow I now need to get some sleep