Dietary fiber or “roughage” is that part of plant substances that are resistant to digestion and hydrolysis by the digestive enzymes as it passes through the gastrointestinal system.
Dietary fiber is by no means a single substance, the term “fiber” generally includes a diverse, complex group of substances, e.g. structural polysaccharides such as cellulose and hemicellulose, nonstructural polysaccharides such as pectines, B-glucans, gums and mucilages.
High-fiber-diets-for-weight-loss-and-disease-prevention
High-fiber-diets-for-weight-loss-and-disease-prevention
The vast bulk of dietary fiber is constituted by polysaccharides, the remnants of edible plant cells, of plant origin. The cellulosic wall surrounding plant cells is the most obvious dietary fiber. Lignin is structural non-polysaccharides found in dietary fiber.

Classification 

Dietary fibers are classified into soluble and insoluble fiber by their water solubility and the relative resistivity to being converted into fermentable and nonfermentable fiber fractions by microbial degradation.

Insoluble fiber

Insoluble fiber, as the name suggests, remains substantially intact as it passes through the gastrointestinal or digestive system.

Soluble fiber

Soluble fiber remains undigested by undergoes metabolic processing through fermentation. In general, cellulose (including hemicellulose) and lignin are water insoluble, while gums, pectines and mucilages are water soluble. Soluble fiber is typically found in fruits and vegetables, in particular citrus fruits and apples.

Dietary fiber benefits

  1. It has been known that dietary fiber is essential to good health.
  2. Dietary fiber detoxifies and expediates the removal of toxins and carcinogens.
  3. It assists the digestion process since it provides an indigestible biomass which is delivered through the alimentary canal resulting in undigested food to be thrusted out before it.
  4. The fibers bind to toxic substances in the small intestine and stomach and then push them out through the gastrointestinal trauntilill the toxins and carcinogens are excreted.
  5. Cholesterol, bile acids, and toxic heavy metals are all attachefibreshe dietary fibers and excreted in Fibresme manner.
  6. Fibers also clear out harmful bacteria and ensure the proper functioning of the peristaltic muscles.
  7. Medical and nutritional research showsfibre diet high in fiber can help prevent diabetes, obesity, hypertension, cardiovascular disease, osteoporosis, gastrointestinal diseases, and several types of cancer.
  8. Foods high in insoluble fiber content are known to increase bile acid secretion, modify fat absorption, decrease endogenous cholesterol production, improve regularity and bulk formation, and promote peristalsis to reduce transit time of toxins and waste out of the body.
  9. Water-fibrele fiber has been linked to such beneficial health effects as blood sugar regulation in diabetic patients, reduction of high serum cholesterol and triglyceride levels (anti-hypercholesterolemia), and prevention of colon cancer, coronary heart disease and arterfibreerosis. Fibrele fiber does not dissolve in water but absorb water like a sponge in the stomach and small intestine. This creates a feeling of satiety, helps to soften the stool and ease evacuation, and leads slow food absorption which makes it useful in weight loss and the treatment of diabetes.
  10. Due to the overall nutritional value of high dietary fiber diet, there has been considerable interests in using dietary fiber supplements for weight loss, lowering rates of intestinal and colon cancer, minimizing the risk of cardiovascular diseases and reducing other problems such as ulcer formation, ileitis and colitis, which are commonly resulted from poor digestion.
  11. Fiber diet may provide protection from several disease.
  12. Fiber dilutes colonic contents, speeds transit time, increases bulk and modifies the bacterial metabolism.
  13. fibrery fiber can change lipid metabolism by altering fatty acid metabolism or lipoprotein lipase activity, interacting with cholesterol Fibrerption pFibres.
  14. Fiber has been shown to influence carbohydrate metabolism and change hormonal levelfibregh fiber diets are typically lower in animal products such as cholesterol and saturated fat which are a big contributor to heart diseases.
Epidemiological evidence suggests the reduced incidence of colon cancer and chronic heart diseases associated with the consumption fibregh fiber diets.

In fact, the deficiency in fibrery fiber is associated many diseases including heart disease, colon cancer, irritable bowel syndrome, appendicitis, colitis, diverticulitis, inttoxaemia toxemia, cerebral apoplexy, cholelithiasis and diabetes.

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