There have been nearly 200 cases of measles in the UK so far this year.
Measles can be prevented with vaccines - but the proportion of children being immunised is declining across the UK, particularly in parts of London.
James visits Hackney, which has one of the lowest vaccination rates in the country, to find out why and to see what is happening to tackle this issue.
And have you tried an adaptogenic drink? They claim to relax the mind, without giving you a boozy hangover.
James samples some in the lab and then gets behind the wheel of a simulator to see what it does to his driving skills…
Presenter: James Gallagher Producer: Gerry Holt Researcher: Thomas Hunt Editor: Ilan Goodman Production coordinator: Stuart Laws Sound engineer: Giles Aspen
Inside Health was made by the BBC’s Audio Science Unit in collaboration with The Open University.