Take a nice deep breath in… through your nose. It’s a simple way to get healthier gums, a better memory, and improved lung function. How? Well, it may partly be due to a special molecule called nitric oxide. Michael Mosley speaks to Professor Jon Lundberg from the Karolinska Institute in Sweden who made the fascinating discovery that nitric oxide is produced in your nose and travels to your lungs where it has some surprising benefits, including boosting oxygen uptake and possibly helping you fight off infections. Our volunteer Joe tries out a few tips to make nasal breathing a habit.

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Producer: Nija Dalal-Small