he recommended fiber intake is 20 - 35 grams per day for adults, or 10 - 13 grams for every 1,000 calories in the diet. This recommended amount should come from a combination of soluble and insoluble fiber, since each type provides different benefits. While it's not necessary to track, a 3:1 ratio of insoluble to soluble fiber is typical. Although neither type is absorbed by the body, they have different properties when mixed with water, hence the designation between the two. However, due to overlap in function between the two types and disparities in measurements of each depending on the method used, the National Academy of Sciences has recommended that these terms "gradually be eliminated and replaced by specific beneficial physiological effects of a fiber". Thus you may hear less about "soluble vs. insoluble fiber" in the future.
Soluble fiber is "soluble" in water. When mixed with water it forms a gel-like substance and swells. Soluble fiber has many benefits, including moderating blood glucose levels and lowering cholesterol. The scientific names for soluble fibers include pectins, gums, mucilages, and some hemicelluloses. Good sources of soluble fiber include oats and oatmeal, legumes (peas, beans, lentils), barley, fruits and vegetables (especially oranges, apples and carrots).
Insoluble fiber does not absorb or dissolve in water. It passes through our digestive system in close to its original form. Insoluble fiber offers many benefits to intestinal health, including a reduction in the risk and occurrence of hemorrhoids and constipation. The scientific names for insoluble fibers include cellulose, lignins, and also some other hemicelluloses. Most of insoluble fibers come from the bran layers of cereal grains.
Since dietary fiber is found only in plant products (i.e., nuts, whole grains, legumes, fruits and vegetables), these are essential to a healthy diet. The average American significantly falls short of the recommended amount of...
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