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Soluble and insoluble fiber

Soluble and insoluble fiber

Dietary fiber is the part of food that is not affected by the digestive process in the body. Only a small amount of fiber is metabolized in the stomach and intestine, the rest passes through the gastrointestinal tract and makes up part of the stool. There are two types of dietary fiber, soluble and insoluble. Soluble fiber retains water and turns to gel during digestion. It also slows digestion and nutrient absorption from the stomach and intestine, and it helps lower cholesterol and blood sugar levels. Soluble fiber is found in foods such as oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. Insoluble fiber speeds the passage of foods through the stomach and intestines and adds bulk to the stool, making bowel movements easier to pass. It is found in foods such as wheat bran, vegetables, and whole grains.

Fiber is very important to a healthy diet and can be a helpful aid in weight management. One of the best sources of fiber comes from legumes, the group of food containing dried peas and beans.






Review Date: 12/26/2011
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital.
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