Insoluble fiber is best for easing constipation, according to WebMD. This type of dietary fiber increases the bulk of stool, which helps it make its way through the intestines. Sources of insoluble fiber include whole grains, cereals, seeds, wheat bran, and fruit and vegetable skins.
When stool passes easily through the intestines, conditions such as hemorrhoids and diverticular disease are less likely to develop, explains Mayo Clinic. The soluble type of dietary fiber dissolves in water.
Soluble fiber offers different benefits, including lowering blood cholesterol and glucose levels. It also helps the body absorb nutrients, WebMD says. Foods with significant amounts of soluble fiber include dried beans, oats, citrus fruits, apples and potatoes.