What are sources of fiber?

Raw fruits and vegetables, whole wheat, and other whole grains.

In fact, all dietary fiber is found only in plant foods: fruits, vegetables, nuts, and grains. Meat, milk, and eggs do not contain fiber. Canned and frozen fruits and vegetables contain just as much fiber as raw ones. Drying and crushing, however, destroy the water-holding qualities of fiber. Removing seeds, peels, or hulls also reduces fiber content. Whole tomatoes have more fiber than peeled tomatoes, which have more than Tomato Juice. Likewise, whole wheat bread contains more fiber than white bread.