The key to depression, obesity, alcoholism – and more? Why the vagus nerve is so exciting to scientists

That's the title of a great article in The Guardian about the vagus nerve. The vagus nerve is a two-way communication channel, linking the brain with the heart, lungs and a number of other vital organs. This pathway helps to control involuntary processes, such as breathing, digestion and immune response. Over 200 years ago, scientists …