Fruits n veggies. Fruits and vegetables are high on fiber.
Fiber sources. Fiber is found in fruits (blueberries, cranberries, apples), vegetables (broccoli, radicchio, endive, spinach), whole-grain breads (whole-GRAIN more than whole-WHEAT) and some breakfast cereals. Fiber supplements exist as well. It's always better to include all sources of fiber as part of a healthy, varied meal plan. 35 grams daily for women, 50 for men. And drink lots of water.