DIETARY FIBER IMPORTANCE

DIETARY FIBER IMPORTANCE

1. Dietary Fiber Gandham.Rajeev Email:[email protected]

2. The complex carbohydrates that are not digested by the human enzymes are collectively referred to as dietary fiber . These include cellulose , hemicellulose, pectin, Iignin , gums & mucilage. Some of the fibers are digestible by the enzymes of intestinal bacteria (e.g. pectins , gums.

3. Prevents constipation: Fiber helps to maintain the normal motility of gastrointestinal tract (GIT ) & prevents constipation. Eliminates bacterial toxins: Fiber adsorbs large quantities of water & also the toxic compounds produced by intestinal bacteria that lead to increased fecal mass & its easier expulsion.

4. Decreases GIT cancers: The lower incidence of cancers of gastrointestinal tract ( e.g. colon & rectum ) in vegetarians compared to non-vegetarians is attributed to dietary fiber . Improves glucose tolerance: Fiber improves glucose tolerance by the body. This is mainly done by a diminished rate of glucose absorption from the intestine.

5. Reduces plasma cholesterol level: Fiber decreases the absorption of dietary cholesterol from the intestine. Fiber binds with the bile salts & reduces their enterohepatic circulation . Causes increased degradation of cholesterol. Satiety value: Fiber significantly adds to the weight of the foodstuff ingested & gives a sensation of stomachfullnes .

6. The harmful effects are mostly observed in people consuming large quantities of dietary fiber. Digestion & absorption of protein are adversely affected. The intestinal absorption of certain minerals (e.g. Ca , P, Mg) is decreased. Intestinal bacteria ferment some fibers , causing flatulence & often discomfort. Adverse affects of fiber

7. Fruits , l eafy vegetables , vegetables, whole wheat legumes, rice bran etc. are rich sources of fiber. An average daily intake of about 30 g fiber is recommended. Sources of dietary fiber

8. Textbook of biochemistry - U Satyanarayana References

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