There are various foods which are rich in fiber and some of them are cauliflower, broccoli, cabbage, berries, mushrooms, oranges, corns, white and black beans, avocado, whole wheat pasta, brown rice, whole wheat bread, pear, oatmeal, raspberries, etc. All these foods improve our health as well as our digestive system. It is recommended to take approximately 25 to 40 grams of fiber daily in a diet.