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I have been running for years but have been plagued by runners diarrhea which seems to be pretty common. I live in a rural area, so my routes have always been limited and I have sometimes worried about running with friends as its so embarrasing. I love running so have always found a way round it but it is really annoying and has knocked many a minute off marathon times even with immodium. A friend recommended trying Fybogel which is a bulk forming fibre drink used for people who are constpiated. I was really cynical as my problem is very much the opposite of constpation and I eat a good diet. But I have started taking a sachet every evening and it works. I have been running for 3 weeks now with no toilet stops (even on long runs 15 miles) which I have never done. I am so pleased I am running different routes and feel great. Just wanted to share incase it helps anyone else. I guess the bulk forming stuff stops the diarrhea and it seems to be as simple as that