In addition to stress, food sensitivity can be a major cause of IBS. Dr. Porter will guide you through mental exercises where you will lay out a plan to avoid the foods that worsen your symptoms. You will also use visualization to creatively increase your fiber intake, which can improve bowel function. You will relax and focus on getting the two types of beneficial fiber: Soluble fiber that helps both diarrhea and constipation by forming a gel-like material, and insoluble fiber, which helps constipation by moving material through your digestive system and adds bulk to your stool.