This is just my opinion, (well - actually, I suppose there are quite a few others who agree with me on this issue), but IMO, it is usually best to get it out of your system. Here's my logic: Diarrhea occurs for a reason - it is a result of a "purge the system" command, from the enteric nervous system.
Diarrhea usually results from a disruption in the digestive system, that is either chemical, or pathogenic in origin. With MC, it is chemical. About 87 % of people with MC, have secretory diarrhea. The main pathophysiological mechanism in LC, (which apparently causes secretory diarrhea), is due to a decrease of active sodium absorption. This obviously results in higher than normal concentrations of sodium in the fecal stream. This chemical change, (together with increased levels of other electrolytes, such as potassium, and chloride), triggers secretory diarrhea. If electrolytes are not only not being absorbed, but are actually being secreted into the lumen, in order to purge the system, then there is little point in trying to prevent it from happening, IMO.
That said, it is usually true that retarding motility helps to restore normal BMS. (Obvious exceptions are C. diff, botulism, salmonila, and other reactions to serious, toxic pathogens). So, I suppose what I am suggesting, is that major reactions are probably best left to run their course, (or at least, not treated with an anti-diarrheal agent), while minor episodes can be safely treated, to enhance the chances of an earlier resolution of symptoms.
I can see at least one advantage to retarding rapid transit BMs - electrolytes are absorbed in the colon, so even if they are secreted into the small intestine, as the result of a "purge" cycle, it is probably still possible to recover at least some of them in the colon, (since electrolytes are the only "nutrients" besides water, that are absorbed in the colon). Of course, doing so may impose an increased risk of inflammation to the colon, since there is evidence that the fecal stream contains toxic inflammatory agents, (which are presumably the reason for the issuance of the "purge command", by the enteric nervous system, in the first place.
At least that's how I see it.
Tex

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