The world of tracking apps has grown in the last decade, but where does all that data go? India speaks to the Chief Medical Officer of Clue, Dr Lynae Brayboy about the importance of tracking periods, and the link between tracking apps and research.

Later, India is joined by Eva Blum-Dumontet, a Senior Policy Advisor on Artificial Intelligence at Royal Society who formerly carried out key research into data and tracking apps. Eva offers a word of warning over the type of data these apps ask for.

Credits:

Special thanks to all contributors and audio diarists.

A Listen production for BBC Radio 4 and BBC Sounds.