I found some information on IBS. Check out the following website: http://www.quackwatch.org/03HealthPromotion/ibs.html . It explains a little about IBS and it gives some tips for managing it. Hope this helps.

While going on the internet I also happened to run across the following book from the American Dietetic Association's website (http://www.eatright.org/Public/NutritionInformation/92_13216.cfm).

"Tell Me What to Eat if I Have Irritable Bowel Syndrome by Elaine Magee. The Career Press, Inc, 2000 ISBN: 1564144445
This book provides an overview of the disease and discusses the link between nutrition and ISB. Readers gain a better understanding of what IBS is and what they can do to limit the impact of its symptoms. Also included are dozens of healthful recipes, plus supermarket and
restaurant advice and how to incorporate changes into your everyday lifestyle. "