Dietary fiber is indispensable for good digestive health. Fiber diminishes constipation, diverticulitis, hemorrhoids and varicose veins, as well as detoxifies the body by cleansing the intestines and causing food to pass through more rapidly. There are two types of dietary fiber, soluble and insoluble. Both are necessary because, while the insoluble fiber appears to speed the passage of foods through the stomach and intestines, the soluble and insoluble fibers in conjunction would increase the bolus which helps prevent constipation. Soluble fibers reach the colon undigested, being an excellent food for "good" bacteria in the intestinal flora. Eat plenty of vegetables and drink a large amount of water.