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* Consider checking with your doctor about [http://en.wikipedia.org/wiki/Irritable_bowel_syndrome Irritable Bowel Syndrome], parasitic infection such as [http://en.wikipedia.org/wiki/Giardiasis Giardia] or other medical issues.
** If you drink untreated water, you may contract Giardia, which causes diarrhea. The incubation period for Giardia is 6-15 days, so the affect will not be immediate.
* If you are not ‘regular’ (i.e. at least daily) it may help to review your diet to increase your fluid intake, increase your fiber [[Fiber]] intake or reduce anything that may ‘bind’.
* Understand outdoor defecation techniques - http://www.survivaltopics.com/survival/outdoor-defecation-techniques/
==Specific Suggestions==
* Try limiting high fiber [[Fiber]] foods the 24 hours before a long run.
** Alternatively, more fiber may actually help. More fiber may help the GI tract to empty in a timely fashion (i.e. before the run). For instance, taking some fiber the night before could help the GI tract empty the next morning before the run.
* Stimulants such as [[Caffeine]] and Chocolate ([http://en.wikipedia.org/wiki/Theobromine Theobromine]) can stimulate or irritate the GI tract. Taken before the run they may help to empty the GI tract, but on a run they may cause problems.