This Nature Outlook is editorially independent, produced with financial support from Yakult. About this content. We are not alone in our bodies. Each person is home to trillions of bacteria, viruses ...

Katrina Carter, DPT, FNS, is a licensed travel physical therapist. She specializes in orthopedics and has a passion for providing education on nutrition for healing and overall health and wellness.

As a staff writer for Forbes Advisor, SMB, Kristy helps small business owners find the tools they need to keep their businesses running. She uses the experience of managing her own writing and editing ...