OK this may sound gross and I know I'll get a bunch of stupid responses but I got a serious question. What is wrong with you when your crap is green? Not just brownish-green but really, really, it's-not-supposed-to-be-that-green kinda green.
I'm thinking it might be the water that I've been drinking but could this be a running related problem? It's never happened before and I've run for quite a while.