You have a higher chance of getting cancer at a younger age than your parents. So what went wrong? | Devi Sridhar

Some change in our lifestyles and environments over a generation has caused this increased risk. What, exactly, is a mystery

• Prof Devi Sridhar is chair of global public health at the University of Edinburgh

In the field of global health, we often talk about each generation living longer and healthier lives than their parents. We’ve seen this in the gains in life expectancy, the sharp decrease in child mortality and in the near elimination of many vaccine-preventable diseases. But since the turn of the century this progress has stalled, and in some cases several health metrics have gone backwards.

Take cancer, which was long thought to be a disease linked to old age. While most cancers do indeed still occur in elderly people, a new report highlights that a number of cancers are increasing in people who are under 50, often referred to as “early onset cancer”. The report, undertaken by the World Cancer Research Fund, looked at data from 12 different cancer types in England, the US and the Netherlands over the past 20 years. What they found isn’t pretty.

Prof Devi Sridhar is chair of global public health at the University of Edinburgh