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1 Soluble fiber is found in oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. It is also found in psyllium, a common fiber supplement. Some types of soluble fiber may help lower risk of heart disease.  Insoluble fiber is found in foods such as wheat bran, vegetables, and whole grains.
Dietary fiber is a type of carbohydrate that comes from plant foods. It's found in fruits, vegetables, grains, nuts and beans. Two types of dietary fiber exist -- soluble and insoluble fiber. The first absorbs water in your digestive tract and swells to create a gel. Soluble fiber may help lower your cholesterol and regulate blood sugar, according to MayoClinic.com.