Insoluble fiber on the other hand, 'adds bulk to the stool and appears to help food pass more quickly through the stomach and intestines.' ("Medline Plus").
Prebiotics are soluble and insoluble fiber. A few examples are psyllium husk, flax seeds and fructooligosaccharides (FOS).
Insoluble fiber reduces the risk of colon cancer and high blood pressure. Fruit fiber seems to be more beneficial then vegetable or cereal fibers, probably because fruits are loaded with Pectin, an insoluble fiber.
Both soluble and insoluble fiber is important as soluble fiber can dissolve easily in water becoming a soft, gel like texture in the intestines which makes it easier to pass. Whereas insoluble fiber can pass through your colon unchanged.
Sometimes, a distinction is made between soluble fiber and insoluble fiber. Soluble fiber partially dissolves in water and has been shown to lower cholesterol. Insoluble fiber does not dissolve in water, but that's why it helps with constipation.
Dark green leafy veggies, fruit skins , whole grains, seeds and nuts are great sources of insoluble fiber and provide bulk to the intestines.
One of the other major benefits of hemp protein supplementation is the very high insoluble fiber content of the powder. Fiber helps keep your blood sugar stable (ideal for fat loss), not to mention helping to keep you "regular.
Soluble fiber: reduction of serum cholesterol
Insoluble fiber: decreases constipation and reduction of colon cancer
20-35 grams recommended
Pinto bean and apple supplies soluble fiber requirements ...
Found in fruits, vegetables, beans, legumes, lentils, and whole grains. Insoluble fiber helps promote bowel regularity by adding bulk to the stool. Soluble fiber may help reduce blood cholesterol levels.
Any of a class of extracellular proteins abundant in humans in the skin, bone, cartilage, tendon and teeth, forming strong insoluble fibers and serving as connective tissue between cells.
Endorphins ...
Soluble fiber in cereals, oatmeal, beans and other foods has been found to lower blood cholesterol. Insoluble fiber in cauliflower, cabbage and other vegetables and fruits helps move foods through the stomach and intestine, ...
 See also: Fiber, Fat, Health, Exercise, Cholesterol
  
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