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。