The diet that is often recommended for this IBS is the Specific Carbohydrate Diet by Elaine Gottschall.

Quote from her website: "The Specific Carbohydrate Diet™ has proven to be highly successful for many who suffer from various bowel disorders as well as the many related problems which actually stem from imbalances in the intestinal tract. http://www.breakingtheviciouscycle.info/

Supplements for IBS would include: Ground Flax Seeds, Slippery Elm and Fish Oil.

I would suggest having a full workup done in person by a Naturopathic or Holistic Medical Doctor.

My new book Meals That Heal Inflammation also covers the topic of IBS.

http://www.breakingtheviciouscycle.info/