Abstract
Hill (31) has postulated that the microflora of the gut produce carcinogens from, most probably, bile acids, and Visek (74) has suggested that ammonia, produced from microbial degradation of dietary protein in the lower gut, is a possible carcinogen. Both hypotheses are probably secondary to what seems to be the primary cause, a deficiency of dietary fiber which has been implicated in diverticular disease of the large bowel, carcinoma of the colon, ischemic heart disease, diabetes mellitus, and gallstone formation (9, 10, 14, 16, 27, 55, 58). Although by definition fiber is indigestible by the secretions of the gastrointestinal tract, there is sufficient evidence to show that the monogastric animal, in addition to the ruminant and nonruminant herbivore, has a microbial population (23) in the tract capable of utilizing plant structural carbohydrates as a source of energy (Table 1). However, no cellulolytic organisms have yet been isolated from human feces (35), although Bryant (8) has characterized strains of Rumunococcus and Bacteroides fragilis, many of which can ferment pentoses and possibly hemicelluloses.
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Robertson, J.B. (1978). The Detergent System of Fiber Analysis. In: Spiller, G.A. (eds) Topics in Dietary Fiber Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2481-2_1
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