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Ten také slouží k ukládání studentských seminárních prací z předmětu Cosmetology, který je vyučován na 1. lékařské fakultě Univerzity Karlovy.

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  1. Annie Ncuti says:

    Annie Ncuti
    Group 3052

    Soluble and insoluble dietary fiber in digestive tract

    Fiber is listed as a must on the vast majority of diet books and recipes. We all know it is important; but what exactly is it? What are the best sources? What are the health benefits?
    Fiber is a type of carbohydrate that cannot be digested by the human digestive system because we lack the necessary enzymes to cleave the glycosidic bond. They are found in vegetables, grains and fruits.
    Dietary fiber can be categorized according to its source; for example, fiber from grains is called cereal fiber, or its solubility. Soluble fiber partially dissolves in water whereas insoluble fiber doesn’t. These differences are important when we look at the impact of fiber on the risk of developing certain disease.
    Examples of sources of soluble fiber: beans, peas, oats, flex seed, avocados, plums, berries, bananas, pears, vegetables (such as broccoli, carrots), sweet potatoes, onions. Nuts and almonds contain the highest concentrations.
    Examples of sources of insoluble fiber: whole grain foods, wheat and corn, nuts and seeds and potato skins, green beans, cauliflower, zucchinis, fruits (such as kiwi, grapes and tomatoes).
    Dietary guidelines suggest that children and adults consume at least 20 grams of dietary fiber per day, but teenagers and men should consume more fiber (30-35 g per day). It has been shown that the fiber intake requirement increases as your daily calories intake increases.
    How it works:
    This is a mechanism by which the fiber binds to the content of the GIT and changes their viscosity, rendering them more viscous and less available for absorption. Insoluble fiber has been associated with reducing risks for diabetes but lessening carbohydrate absorption.
    Benefits for the digestive tract:
    It was not been proven that a high fiber diet prevents colon cancer but this could be due to the concomitant intake of factors that increase risks of developing cancer ( alcohol, high caloric diet, red meat).
    The right side of the colon (cecum and ascending colon) is the site of fermentation; fiber, fat and proteins are used by the bacteria and the resulting products are absorbed back into the blood. Soluble fiber can dissolve in water and are fermented in the GIT.
    The left side of the colon (transverse, descending and sigmoid colon) plays a role in continence. Insoluble fiber cannot dissolve in water and form bulks of fiber that helps passing bowel movements.
    This is a very common, painful inflammation of the intestine; usually arises after 45 years of age and in the western world affects about 2/3 of the people over 85 years old. Studies show that a diet rich in insoluble fiber might decrease the risk of developing diverticulitis.
    Fiber and constipation
    Constipation is the most common gastrointestinal chief complaint of patients. It manifests as infrequent or failure to pass bowel movements. Dietary fiber can alleviate the symptoms of constipation by bulking the GIT content and facilitating bowel movements.
    Experts recommend gradually increasing the intake of fiber and not starting with a high fiber diet. Also, as fiber absorbs fluids, the consumption of water should be increased as one start following a diet rich in fiber.

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