Our Future Health
https://ourfuturehealth.org.uk/
This is a health study of, eventually, 5 Million people. The aim is to have sufficient data, accross a whole spectrum of the population to discover and find ways of treating disease and illness before developing into a serious condition.
They have 2.5 million people already signed up. The website, linked above, will fill in all of the details. If it is for you then please join.
Cheers
Robin