The science behind cancer warnings on coffee is murky at best

A review of more than 1,000 studies found no consistent link between drinking coffee and more than 20 types of cancer, according to a working group of scientists who met in 2016 at the International Agency for Research on Cancer, a World Health Organization group. These studies examined the epidemiological evidence, meaning they looked for increased risk across populations of coffee drinkers and non-drinkers.