Tackling depression and anxiety via the gut – the amazing story of how a sad mouse could change the treatment of mental health. And how to keep your own gut as happy as possible.Happiness expert Gretchen Rubin offers tips on how to be happy, even if you’re British.

Writer & Presenter: Tim SamuelsExecutive Producer: Barney RowntreeProducer: Nick MinterAssistant Producer: Sera BakerResearcher: Roser Jorba SolerMixing & Sound Design: Ali RezakhaniStory Sound Design: James MorganOriginal Music: Xavior RoideSeries Editor: Gloria Abramoff

All Hail Kale is made by Tonic Productions for BBC Sounds.