Researchers are calling on five million UK adults to join what they hope will be one of the biggest studies in the world, to create the most detailed picture ever of the nation's health.
The aim is it to find better ways to prevent, spot and treat illnesses like cancer and dementia early on. It will involve collecting health and genetic data and creating a long-term repository of health information.
Our Future Health is part-funded by government, industry and charities. They hope to get their first set of results in the next few years.
Chairman of the programme, Prof Sir John Be