Gastrointestinal Responses to Dietary Fiber
Various sources of dietary fiber can slow the process of digestion and absorption of macronutrients. It is likely that the physical properties of fiber sources such as particle size, viscosity, water-holding capacity and gel formation, and bile acid binding capacity are important in determining the effect of a fiber source on gastrointestinal function and nutrient absorption. The effects of fiber on gastrointestinal function have recently been reviewed (Schneeman, 1987, 1989; Vahouny and Cassidy, 1985) and several mechanisms have been suggested by which the physical properties of fiber slow digestion and absorption. In reviewing the experimental evidence it is clear that dietary fibers can affect the functioning of all of the gastrointestinal organs. For example, viscous polysaccharides slow gastric emptying and hence the rate of nutrient delivery to the small intestine. Within the small intestine various types of fiber can interfere with digestive enzyme activity, slow diffusion and mixing, and bind components from micelles.
KeywordsBile Acid Dietary Fiber Wheat Bran Intestinal Content Postprandial Lipemia
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- Ebihara, K., and Schneeman, B. O., 1989, Interaction of bile acids, phospholipids, cholesterol and triglyceride with dietary fibers in the small intestine of rats, J. Nutr., in press.Google Scholar
- Furda, I., 1983, Aminopolysaccharides — Their potential as dietary fiber, in “Unconventional Sources of Dietary Fiber,” I. Furda, ed., ASC Symposium Series 214, Washington, DC, pp. 105–122.Google Scholar
- Gallaher, D., and Schneeman, B. O., 1986, Intestinal interaction of bile acids, phospholipids, dietary fibers, and cholestyramine, Am. J. Phvsiol., 250:G420.Google Scholar
- Isaksson, G., Lundquist, I., Akesson, B., and Ihse, I., 1984, Effects of pectin and wheat bran on intraluminal pancreatic enzyme activities and on fat absorption as examined with the triolein breath test in patients with pancreatic insufficiency, Scand. J. Gastroenterol., 19:467.Google Scholar
- Jenkins, D. J. A., 1978, Action of dietary fiber in lowering fasting serum cholesterol and reducing postprandial glycemia: Gastrointestinal mechanisms, in “International Conference on Atherosclerosis,” L. A. Carlson, ed., Raven Press, New York, pp. 173–182.Google Scholar
- Redard, C. L., Schneeman, B. O., and Davis, P. A., 1988, Differences in postprandial lipemia due to gender and dietary fiber, FASEB J., 2:A1418.Google Scholar
- Sandberg, A. S., Ahderinne, R., Andersson, H., Hallgren, B., and Hulten, L., 1983, The effect of citrus pectin on the absorption of nutrients in the small intestine, Human Nutr.:Clin. Nutr., 37C:171.Google Scholar
- Schneeman, B. O., 1989, Macronutrient absorption, in “Proceedings of the Third International Symposium on Dietary Fiber,” In press.Google Scholar
- Vahouny, G. V., and Cassidy, M. M., 1985, Dietary fibers and absorption of nutrients, Proc. Soc. Exp. Biol. Med., 180:432.Google Scholar
- Vahouny, G. V., and Cassidy, M. M., 1986, Effect of dietary fiber on intestinal absorption of lipids, in “Handbook of Dietary Fiber in Human Nutrition,” G. A. Spiller, ed., CRC Press, Boca Raton, FL, pp. 121–128.Google Scholar
- Vahouny, G. V., Satchitanandam, S., Chen, I., Tepper, S. A., Kritchevsky, D., Lightfoot, F. G., and Cassidy, M. M., 1988, Dietary fiber and intestinal adaptation: effect on lipid absorption and lymphatic transport in the rat, Am. J. Clin. Nutr., 47:201.Google Scholar