Dietary Fibre:-
Dietary Fibre is the named callectively given to indigestible carbohydrates present in food. The carbohydrates together with lignin consists of cellulose hemicellylose pectin, plant, gums, mucilage other are hydrophobic. There are highly aluble structural fibers, cellulose, lignin and hemicellylose.
The dietary fibre have a property if holding water and swell and behave like gel as it passes through gastrointestinal tract. Fiber adds bulk to the diet, increase transit time in the gut.
Mechanism of action and function :-
Dietary fibre binde with bile salts and remains unabsorbed.
Prevent its reabsorption in blood and lowers the chalesteral level in air culation.
Some Fibre like gum, pectin in the diet reduced post paramedical blood glucose levels.
Normal requirment: 40 GM's|Day
Excessive intake of fiber in diet may cause advance effect as they bind some trace metals and prevent their absorption hence nutrition is effected.
Dietary fibre is not just beon but a miscellaneous callection of several substance which vary is chemical and physical properties. Some of them are listed below
(1) Cellulose:- It is the best known component of fiber consisting of numerous glucose malecules linked together is long chains to form strong elastic walls of plant cells. It swells is water to form gel.
(2) Hemicellylose:- It is the type of fibre having branched polymens not related to cellulose and are not cellulose precursor as was formerly considered. They contain mostly xylose.
(3) Lignin:- This type is present in the cell wall and is not digestible. The texture of fibre varies from stones, gums, to the woody substance. The physiological role of dietary fibre in human nutrition was so far believed to be related to crude Fibre which help the bowel movement.
Function of dietary fibre in the body:-
(1) Fibers though not digested by intestinal eneymes, but is metabolised by bacteria in the gut. By retaining absorbed water, fibers has an effect on the faecal valume, transit time, flatus products and excretion of bite sold and short chind of faityassid.
(2) The important physiological bbct fibres is retain ncrearethe "bulk" the water Content of and the store.
(3) Fibers is presumed to protect against concert ole searing by transit time for Colonic bacteria to produce.
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