Anxiety is the most common mental illness in the United States. It can be caused by a number of factors including genetics, your environment, and so on. Like all mental issues, anxiety takes its toll on your physical body, too. Studies show a connection between anxiety and gut health, but more interesting than that, research reveals that it goes both ways. This means that anxiety can cause poor gut health, but also be caused by poor gut health, as well. What’s the link between anxiety and gut health?