Dietary fiber is the tough stuff found in fruits, vegetables and grains that resists digestion by human enzymes.

... Dietary fiber is the tough stuff found in fruits, vegetables and grains that resists digestion by human enzymes. Not necessarily a nutrient, it does however play an important role in the digestive process. Studies have shown that high fiber foods are lower in calories, satisfy the appetite, require more chewing and take longer to digest. Other foods are nearly all digested and absorbed as they pass through the small intestine but fiber enters the large intestine almost all intact. Fiber is found in two forms; soluble (unrefined oat products, dried beans, peas, lentils, apples and citrus fruit) and insoluble (vegetables and whole grains). Water soluble fiber absorbs fluid as it moves through the digestive system and studies show that it aids in the reduction of serum cholesterol. Soluble fiber is able to bind acids and prevent their absorption by the body. This causes the body to convert some cholesterol into bile

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