A long-term after-effect of rectal surgery was diarrhea about every 10 days; sometimes urgent. I have been trying dark chocolate in recent weeks, and find that the diarrhea has stopped. There are a number of articles on internet sites (Medscape, etc.) indicating that dark chocolate (I use 90% dark) has been a recommended diarrhea treatment for many years, but none of my doctors ever mentioned it.
I am somewhat angry that none of my treatment providers ever mentioned dark chocolate. My primary care doctor mentioned Activia which made matters WORSE.