Apparently in the realm of "extreme sports", a young woman has gained a medal, and some notoriety, as she soiled herself, and a few things around her (like the track), with explosive diarrhea as she won a competition. No, there will be no pictures.
And it struck me that having done endurance sports throughout my life, and having had the opportunity to be very worried about whether my bowels would stay put through the entire race, and having run quickly to the bathroom or the woods at times, I've got some experience with handling this sort of thing.
The first thing to remember, in my view, is that the porta-potty is there for a reason, and is a medal so important that it justifies exposing everyone to one's personal bowel microbiome?
The other thing that comes to mind comes from an experience I had as a young man. When I got my first apartment and started cooking for myself, it occurred quickly to me that the maple syrup I'd treated myself to really overpowered the white flour pancakes I was making. Hence, I started using whole wheat flour for my breakfast pancakes, and then I noticed fairly soon that I wasn't needing to take nearly as many potty breaks as I did before. It was a bonus both for flavor and my own health.
Moreover, as I consider athletic performance foods--protein bars, gel packs, protein powders, and the like--what I see very often (not always) is that there's a lot of sugar in most of them, and very little fiber in many of them. Now look up how excess sugar, and a lack of fiber, can lead to diarrhea. Yes, sugar goes quickly to glycogen and muscle energy, but it also has other effects.
Your fellow runners will thank you. Take it a little easy on the sugar, get some good fiber (oatmeal is apparently key for many Olympians at breakfast), and have a great, filth-free race.