There is this study: http://www.sciencedaily.com/releases/2014/09/140929181156.htm http://www.sciencedaily.com/releases/2014/09/140929181156.ht... Although it

There is this study: http://www.sciencedaily.com/releases/2014/09/140929181156.htm http://www.sciencedaily.com/releases/2014/09/140929181156.ht... Although it is looking into obesity, they did find that apples restored abnormal microbiota. I suffer from mild IBS myself, and find that eating an apple a day seems to help (although it's impossible to know for sure without doing a double-blind trial on myself).