Fiber is probably best known for its ability to help with constipation. But fiber also can lower your risk of diabetes and heart disease. How can you get more fiber? Choose cereals with whole-wheat, bran or fiber in the name. Switch to whole-grain breads and pastas. Experiment with brown rice, wild rice, barley and bulgur wheat. Increase fiber in your diet gradually over a few weeks. Also drink plenty of water; fiber works best when it absorbs water.