Fiber is primarily found in whole grains. Bread, spaghetti and other whole-wheat products are high in fiber to help your digestive system. In addition, most fruits and vegetables will help to increase the fiber in your diet. High fiber foods are known have a direct impact on Irritable Bowel Syndrome and the digestive tract. Sometimes, IBS is an indicator that your diet is not high enough in fiber.Soluble fiber is able to dissolve in liquid, including the water you drink with your meal. This water absorption allows the fiber to move easily and quickly through the digestive tract. Drinking plenty of water with your meals will help soluble fiber to be most effective.

The other type of fiber is insoluble fibers. Insoluble fiber is typically found in the cellulose of certain foods. Seeds, root vegetables, cabbage, wheat bran and corn bran also contain high amounts of insoluble fibers. While insoluble fiber is a key part of a healthy diet, those with IBS should be careful to avoid insoluble fiber on an empty stomach as this can exacerbate your symptoms. During an IBS attack, you may find that consuming additional fiber will help to relax your digestive system, and return you to normal. You may want to consider a fiber supplement, such as Metamucil or Fibercon, to relieve your symptoms.