Cut Back on Refined Foods
Bump up your fiber intake by switching from refined foods to less-refined foods whenever possible. Switch from a highly processed cereal to a whole-grain cereal, move from heavily cooked vegetables to less-cooked vegetables, and choose whole-grain products over products made with white flour. A serving of white rice has 0.5 grams of fiber; a serving of brown rice contains 2.4. And while a serving of potato chips has only 0.6 grams of fiber, a serving of popcorn supplies 2.5 grams.