从出生到整个生命历程，我们与肠道内寄居的细菌和其他微生物和谐共处——这一动态集合被称为肠道菌群。
这数以万亿计的细菌对我们的健康至关重要。它们在维持消化系统运转、帮助免疫系统防御致病病毒等入侵者等关键身体功能中发挥着重要作用。
但有时，肠道菌群会受到干扰：科学家将这种情况称为“菌群失调”。
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