I don't think you get the runs from too much fiber, and no fiber gets to the finished product anyway. At a guess I'd say yeast or even more likely, coincidence.
This is a gross thread
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit