A July 2019 study by the University of Leeds found that transcutaneous vagus nerve stimulation, “may slow down an important effect associated with ageing.”

Dr Beatrice Bretherton said, "The ear is like a gateway through which we can tinker with the body's metabolic balance, without the need for medication or invasive procedures. We believe these results are just the tip of the iceberg.

"We are excited to investigate further into the effects and potential long-term benefits of daily ear stimulation, as we have seen a great response to the treatment so far."