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As we get older, the large bowel may become
随着年龄增长
peppered with these little blow-outs,
大肠表面会布满小憩室
and this is diverticular disease.
就此患上憩室症
In 1975, Horizon reported on the hard-won discovery
1975年 地平线曾做过一项来之不易的报道
made by one man's trip to the ends of the earth.
由一位专家在非洲完成
Dr Alex Walker was trying to understand why Africans,
阿列克斯·沃尔克博士试图了解
still living on a traditional high-fibre diet,
为何始终保持高纤维膳食的非洲人民
remained free from Western diseases like diverticular disease.
不会患上例如憩室这种西方病
In this experiment, African schoolchildren
该实验会发给每位非洲学生
are being given red dye marker pills
一粒红色药片
to measure the speed of
用于测量
transit of their food through their bodies.
人体输送食物的速度
Dr Walker has found that in rural Africans on traditional diets,
沃尔克博士发现那些饮食传统的非洲村民
food passes much more
食物在肠内的传递速度
quickly through the bowel than in urban whites.
比生活在城市的白人要快
In the European, food waste
在欧洲 食物废渣
may stay in the colon for as long as two weeks.
在人体结肠内的停留时间会长达两周
In the rural Africans, it may be as little as 12 hours.
而非洲乡村的人们仅仅只有12小时
