Pomare E W, Heaton K W
Br Med J. 1973 Nov 3;4(5887):262-4. doi: 10.1136/bmj.4.5887.262.
Feeding dietary fibre in the form of bran induced changes in bile salt metabolism in five people with intact gall bladders. There was evidence of reduced dehydroxylation of bile salts; the proportion of deoxycholate conjugates in bile was reduced and the transfer of radioactivity from labelled taurocholate to deoxycholate was decreased. These findings, which were independent of changes in intestinal transit rate, imply that bran reduced the degradation of bile salts by colonic bacteria. This property of bran accords with recent theories that fibre-depleted diets favour the degradation of bile salts in the colon. These findings may be relevant to the aetiology of large bowel cancer.
给五名胆囊功能正常的人喂食麸皮形式的膳食纤维会引起胆汁盐代谢的变化。有证据表明胆汁盐的脱羟基作用减弱;胆汁中脱氧胆酸盐结合物的比例降低,放射性从标记的牛磺胆酸盐向脱氧胆酸盐的转移减少。这些与肠道转运速率变化无关的发现表明,麸皮减少了结肠细菌对胆汁盐的降解。麸皮的这一特性与最近的理论相符,即缺乏纤维的饮食有利于结肠中胆汁盐的降解。这些发现可能与大肠癌的病因学有关。