insoluble fiber examples
1 Soluble fiber is found in oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. 2  It is also found in psyllium, a common fiber supplement. 3  Some types of soluble fiber may help lower risk of heart disease. 4  Insoluble fiber is found in foods such as wheat bran, vegetables, and whole grains.