Avoid gluten
Dr Briffa points out in his blog how people do not have to have coeliac disease to react to gluten. This is an opinion i share and i have also helped many clients with IBS who were not coeliac by removing gluten from their diet. http://www.drbriffa.com/2011/01/26/new-study-shows-that-its-possible-to-react-to-gluten-but-not-have-coeliac-disease/