The website Prebiotin.com offers a comprehensive list of foods containing both soluble and insoluble fiber. Insoluble fiber is one of the most gut-healthy foods, according to WebMD, because they encourage digestive regularity and add considerable bulk to the diet.
Foods that are high in insoluble fiber include whole-grain cereal, kidney beans and cruciferous vegetables such as broccoli, Brussels sprouts and asparagus. Although insoluble fiber is a healthy part of one's diet, it can also cause discomfort in people with irritable bowel syndrome, ulcerative colitis and other digestive disorders, according to Healthline. Patients with these types of conditions should pay attention to their symptoms and consult with their physicians about fiber alternatives.