Mixing Covid vaccines

New evidence on whether mixing Covid vaccines and spreading doses out gives better results.Plus, has five years of food labels in Chile warning of high fat, sugar or salt made a difference to obesity levels? Jane Chambers reports.And what gives some people a sense of entitlement? Emily Zitek, Associate Professor of Organisational Behaviour at Cornell University explains her new research.Claudia's studio guest is James Gallagher, BBC Health and Science Correspondent.Presenter: Claudia Hammond Producer: Erika Wright(Picture: Three vials with different vaccines against Covid-19 by (L-R) Moderna, AstraZeneca and Pfizer-BioNTech. Photo credit: Thomas Kienzle/AFP/ Getty Images.)