It is the indigestible portion of food derived from plants.
Dietary fibers can act by changing the nature of the contents of the gastrointestinal tract and by changing how other nutrients and chemicals are absorbed. Some types of soluble fiber absorb water to become a gelatinous, viscous substance which is fermented by bacteria in the digestive tract. 1 Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be prebiotic and metabolically ferment in the large intestine. 2  Bulking fibers absorb water as they move through the digestive system, easing defecation. Dietary fiber is the edible parts of plants or analogous carbohydrates that are resistant to digestion and absorption in the human small intestine, with complete or partial fermentation in the large intestine. Dietary fiber includes polysaccharides, oligosaccharides, lignin, and associated plant substances. 1 Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be prebiotic and metabolically ferment in the large intestine. 2  Bulking fibers absorb water as they move through the digestive system, easing defecation. Dietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components: 1  Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous. 1 Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be prebiotic and metabolically ferment in the large intestine. 2  Bulking fibers absorb water as they move through the digestive system, easing defecation. Chemically, dietary fiber consists of non-starch polysaccharides such as arabinoxylans, cellulose, and many other plant components such as resistant starch, resistant dextrins, inulin, lignin, waxes, chitins, pectins, beta-glucans, and oligosaccharides. 1 Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be prebiotic and metabolically ferment in the large intestine. 2  Bulking fibers absorb water as they move through the digestive system, easing defecation. Fiber is also known as roughage. It is the indigestible part of plant foods that pushes through our digestive system, absorbing water along the way and easing bowel movements. The word fiber (North American) can also be spelled fibre (British). There are two broad types of fiber, soluble and insoluble. 1  Soluble fiber dissolves in water. 2  It changes as it goes through the digestive tract, where it is fermented by bacteria. 3  As it absorbs water it becomes gelatinous. 1 Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material. 3  It can help lower blood cholesterol and glucose levels. 4  Soluble fiber is found in oats, peas, beans, apples, citrus fruits, carrots, barley and psyllium. Instead, it passes relatively intact through your stomach, small intestine and colon and out of your body. Fiber is commonly classified as soluble, which dissolves in water, or insoluble, which doesn't dissolve. 1  Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material. 3  It can help lower blood cholesterol and glucose levels Dietary fiber is a plant-based nutrient that is sometimes called roughage or bulk. It is a type of carbohydrate but, unlike other carbs, it cannot be broken down into digestible sugar molecules. Therefore, fiber passes through the intestinal tract relatively intact. However, on its journey, fiber does a lot of work. The term “dietary fiber” refers to the indigestible parts of plant-based foods. 1 This type of fiber dissolves in water to form a gel-like material. 2  It can help lower blood cholesterol and glucose levels. 3  Soluble fiber is found in oats, peas, beans, apples, citrus fruits, carrots, barley and psyllium. 4  Insoluble fiber. Instead, it passes relatively intact through your stomach, small intestine and colon and out of your body. Fiber is commonly classified as soluble, which dissolves in water, or insoluble, which doesn't dissolve. 1  Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material. 3  It can help lower blood cholesterol and glucose levels The word fiber is misleading, because many types of dietary fibers are not fibers at all. There are two broad types of fiber, soluble and insoluble. 1  Soluble fiber dissolves in water. 2  It changes as it goes through the digestive tract, where it is fermented by bacteria. 3  As it absorbs water it becomes gelatinous.
https://en.wikipedia.org/wiki/Dietary_fiber https://en.wikipedia.org/wiki/Dietary_fiber https://en.wikipedia.org/wiki/Dietary_fiber https://en.wikipedia.org/wiki/Dietary_fiber http://www.medicalnewstoday.com/articles/146935.php http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/fiber/art-20043983 http://www.livescience.com/51998-dietary-fiber.html http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/fiber/art-20043983 http://www.medicalnewstoday.com/articles/146935.php
what is dietary fiber