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A gut's tale

机译：肠子的故事

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Many of our cells are not...us... Besides the cells we produce, we carry around an awful lot of bacteria. In reality, 90 percent of the cells that make us up are bacterial, that is to say about one billion billion. That's a lot. A large proportion of these bacteria are part of our gut, add an average of 2 kg to our adult weight and form what has been termed our gut microbiome. Why have they set up camp inside us? Because we need them... And vice versa. The human gut hosts bacteria that are able to break down all sorts of molecules we cannot. In exchange, we offer them an environment to thrive in. This mutual parasitism has evolved over time, and is a consequence of the various surroundings humans have lived in, especially the kinds of food we have eaten, and eat. Recently, scientists discovered that a group of Japanese were able to digest polysaccharides westerners are unable to. It turned out that this was most probably the result of the long Japanese tradition of eating 'nori', an edible seaweed species of the red algae, and is due to specific seaweed carbohydrate active enzymes which have become an integral part of their digestive system.
机译：我们的许多细胞不是……我们……除了我们生产的细胞外，我们还携带着大量细菌。实际上，组成我们的细胞中有90％是细菌，也就是说大约有10亿个细菌。好多啊。这些细菌很大一部分是我们肠道的一部分，平均增加了我们成年人的体重2公斤，形成了我们的肠道微生物组。他们为什么在我们里面建立营地？因为我们需要它们...反之亦然。人体肠道中含有能够分解我们无法分解的各种分子的细菌。作为交换，我们为他们提供了赖以生存的环境。这种相互寄生现象随着时间的流逝而演变，这是人类生活在各种环境中的结果，尤其是我们所吃和吃的食物的种类。最近，科学家发现一群日本人能够消化西方人无法消化的多糖。事实证明，这很可能是日本长期以来食用“藻类”（一种可食用的红藻类海藻）的传统的结果，并且是由于特定的海藻碳水化合物活性酶已成为其消化系统的组成部分。

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