I have tried all sorts of things with diet, excluding milk and diary products, wheat etc. I think in some cases, you either have the problem or you don't. I have put on other posts that I try and do about a mile run around home, pop back as it were, and then go out for real - still need imodium for anything over 5 miles, but seems to do the trick - bit of a nuisance, but if I am out with a group it means I don't have to worry, same applies before a race as well.
I started running on the road about 4 years ago, before that I was building up distance and speed on the treadmill and, looking back, I had to stop sometimes then, but never thought much about it - then was OK until about 2 years ago when I speeded up.
Must be something to do with insides being jiggled around. I try and plan runs so that I pass pubs/supermarkets or country lanes etc.
Thought it would make me give up running, but it hasn't - just learnt to live with it.
Unless anyone knows any better....
Whizzy