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布莱克斯堡弗吉尼亚综合研究所的微生物学研究小组的专家们指出:引起肠道癌症的主要原因可能是常见的肠道细菌产生的化学物质。Tracy Wilkins和Roger Van Tassel已发现在布莱克斯堡的一群居民中,有20％的人粪便中有一种化学物质,即诱变剂,能使染色体损伤。这种化学物质的产生与某些肠道细菌的存在和胆汁酸浓度高有关,饮食中的脂肪引起胆汁释放至肠道,富含脂肪的饮食被队为易于诱发肠道癌症。研究人员在南非对以高纤维素和低脂肪饮食居住在乡村的黑人,和更近似西方的高脂肪、精制饮食居住于城镇的白人做了进一步的试验。Wilkins及其同事对这两种人群的粪便
Experts at the Microbiology Research Group at the Virginia Comprehensive Institute in Blacksburg point out that the main cause of intestinal cancer may be common intestinal bacteria-producing chemicals. Tracy Wilkins and Roger Van Tassel have found that 20% of a group of Blacksburg residents have a chemical in their droppings, a mutagen, that damages the chromosomes. The production of this chemical is associated with the presence of certain gut bacteria and the high concentration of bile acids. Fat in the diet causes the release of bile to the gut. Fat-rich diets are being marketed as prone to enteric cancer. Researchers in South Africa conducted further trials of whites living in the countryside with high-fiber and low-fat diets, and whites living in urban areas in the more high-fat, refined western-style diet. The feces of both groups by Wilkins and colleagues