Revolution Health posted an article last week on preventing runner’s diarrhea that may be helpful if you experience this on long runs. Some tips they provide seem fairly obvious (like limiting lactose products if you’re lactose intolerant) while other tips make it obvious the author is not a long distance runner (don’t eat anything at least 2 hours before you run). That last tip is sure to cause you to bonk big time if you’re running a marathon – most folks eat DURING a marathon run so it’s kinda hard to avoid food.
I’d be interested to hear what other runners have found effective for limiting runner’s diarrhea. One more thing I’d suggest may cause RD (as I’m calling it now): nerves. I know some folks who have reported RD in the past, particularly before a big race so perhaps stress could be causing it? Further research is needed… just not on me thanks