'Meanwhile, scientific interest in vagus nerve stimulation is exploding, with studies investigating it as a potential treatment for everything from obesity to depression, arthritis and Covid-related fatigue. So, what exactly is the vagus nerve, and is all this hype warranted?'

https://www.theguardian.com/society/2023/aug/23/the-key-to-depression-obesity-alcoholism-and-more-why-the-vagus-nerve-is-so-exciting-to-scientists