Fiber can soak up water in the intestine, slowing the absorption of nutrients and increasing feelings of fullness ( 15 ). In this way, they promote the growth of “good” gut bacteria, which can have various positive effects on health ( 8 ). This is the most important reason that (some) dietary fibers are important for health.
Schulze MB, Schulz M, Heidemann C, Schienkiewitz A, Hoffmann K, Boeing H: Fiber and Magnesium Intake and Incidence of Type 2 Diabetes: A Prospective Study and Meta-analysis. McKeown NM, Meigs JB, Liu S, Wilson PW, Jacques PF: Whole-grain intake is favorably associated with metabolic risk factors for type 2 diabetes and cardiovascular disease in the Framingham Offspring Study.
Animals and the experimental design
The effects of dietary fiber on lipid metabolism in humans have been described in several comprehensive reviews (Judd and Truswell, 1985; Kay and Truswell, 1980; Story, 1980; Vahouny, 1982, 1985). Fourth, epidemiologic studies that rely on evidence from vegetarians (who as a rule consume more fiber than nonvegetarians) should be evaluated carefully, since most types of vegetarians (e.g., complete vegetarians, lacto-ovovegetarians, and others) differ from omnivores in many ways that may confound the association between fiber intake and health. Several caveats must be borne in mind when reviewing studies on dietary fiber and chronic disease etiology. A more definitive assessment of current fiber intake patterns must await improvement in the food composition data base, now in progress, and more accurate information about dietary practices.
Previously it has been found that intravenous infusions of GLP-1 (50 pmol/kgâ‹… h) during 4 h reduced voluntary energy intake by 12% at a subsequent lunch meal, as compared to saline in young healthy men . In the present study, the BK evening meal decreased the feeling of hunger during the whole experimental day, as compared to the evening WWB, and reduced voluntary energy intake (âˆ’12%) at lunch.
A more possible explanation, however, is that the WB-mixtures were less fermented, thus maintaining the water-holding capacity of the NSP. In the present study, the fecal SCFA pool correlated with the amount of stool water. This was demonstrated by mixing GG and Pec, which gave a much lower cecal proportion of propionic acid (10%) compared with GG alone (31%). A plausible explanation for HAS could be that this is a poor source for butyric acid production.
The significance of wheat extraction rate, zinc, calcium, and protein content in meals based on breads. Metabolic epidemiology of large bowel cancer: fecal bulk and constituents of high-risk North American and low-risk Finnish population. Are fibre supplements really necessary in diverticular disease of the colon: a controlled clinical trial. Dietary lipids, sugar, fiber, and mortality from coronary heart disease: bivariate analysis of international data.
Further, the proportions of propionic and butyric acid in distal colon or in feces were not greater than in the cecum when rats were fed GG or HAS with WB. Similar results were obtained in distal colon, and higher proportions of butyric acid were seen in rats when the substrates were mixed with WB (âˆ¼13%) compared with those fed GG or HAS alone (âˆ¼5%, P < 0.05).="" the="" cecal="" concentrations="" of="" acetic="" acid,="" were="" higher="" in="" rats="" fed="" the="" test="" diets,="" other="" than="" those="" containing="" wb,="" than="" in="" those="" fed="" the="" control="" diet="" (p="">< 0.05)="" (table="" 4).="" wb="" was="" most="" resistant="" to="" fermentation,="" and="" only="" 37="" â±="" 1%="" of="" the="" df="" was="" degraded="" (p=""><>
Lignin in fiber adsorbs bile acids, but the unconjugated form of the bile acids are adsorbed more than the conjugated form. Binding of bile acids to fiber or bacteria in the cecum with increased fecal loss from the entero-hepatic circulation.
Environmental factors and cancer incidence and mortality in different countries, with special reference to dietary practices. Studies in the elderly should be given a high priority, because the elderly may be prone to more severe adverse effects (e.g., calcium malabsorption).
Although fiber intake was inversely correlated with colon cancer mortality, this relationship was no longer significant in a partial correlation analysis controlling for cholesterol intake. Drasar and Irving (1973) failed to find a correlation between colon cancer incidence in 37 countries and per-capita intake of fiber-containing foods, but they did find a negative association with intake of cereals (Irving and Drasar, 1973). In these studies, the lower risk populations had the higher fiber intake. Direct comparisons of fiber intake between two geographic areas with differing colon cancer incidence rates but similar levels of fat intake have been reported for northern and southern India (Malhotra, 1977), for rural Finland and New York (Reddy et al., 1978), and for Denmark and Finland (Jensen et al., 1982).
admin November 1, 2015