As these once-obese humans lost weight over the course of a year, their mix of gut microbes changed to reflect their new, svelte status.
一年的疗程让过去肥胖的人瘦了下来，而且他们不仅拥有了一个苗条的身材同样得到了一个全新的肠道菌群。
2
As these once - obese humans lost weight over the course of a year, their mix of gut microbes changed to reflect their new, svelte status. Why this happened is not clear.
在这一年中，这些曾经肥胖的人的体重逐渐减轻，他们的肠道微生物也发生了改变以反映其日渐苗条的身材。
3
Of course you were. I'm lean. Lean animals yield the toughest gut.