Foods featured in a high-fiber diet include fruits, vegetables, nuts and grains, according to MedlinePlus. All of these foods contain high amounts of fiber, which are carbohydrates that the body cannot digest and, therefore, pass through the body quickly.
Examples of high-fiber vegetables include spinach, beets, broccoli and baked sweet potatoes with the skin attached, states MedlinePlus. Legumes, such as black beans, and nuts, such as almonds, also have high fiber content. High-fiber fruits include apples, prunes and berries. Most grains are rich in fiber, with whole-grains, such as 100-percent whole wheat bread and brown rice, being highest in fiber.