Michael Mosley has lifted the lid on one of the most effective ways to help us live longer - and it may sound like a slight contradiction.
The diet expert says that as well as the obvious factors, like regular exercise and getting enough sleep, there's another key to healthy living and it's all to do with our gut.
Harbouring certain viruses and bacteria there has been proven to help us live longer, despite many of us thinking that viruses are always bad news for our health.
