Tim Spector, Professor of genetic epidemiology at King’s College in London and co-founder of the Zoe Covid Symptom Study app – the world’s largest COVID-19 study – joins us to talks about this revolutionary community science project, downloaded by nearly 5 million UK users. It changed the way we understood coronavirus and Zoe’s on-going nutrition study is aiming to do the same for our diet by building a personalised understanding of how our body responds to food.