Thitikarn Paothongthai/Moment/Getty ImagesNervous system regulation, sleepmaxxing, high-functioning burnout — there is always some hot new health topic du jour. While there’s usually some kernel of true health information buried in the hype, it’s hard to parse what really matters from all the social media “gurus” shilling supplements at the link in bio. This is especially true of “gut health,” a topic that feels like it has dominated wellness spaces for the past few years but also never really comes up in your primary care doctor’s office. So, what does gut health actually mean, particularly...