The greatest threats to public health are far from shocking or contagious. They are familiar and common. Diabetes--a condition that's often the result of excess body weight and physical inactivity--is expected to increase rapidly to become the world's seventh largest killer by 2030. On World Health Day 2016, we have the potential to re-calibrate our priorities, recognize the public health threat diabetes poses and do something about it. We can defy expectations and beat the diabetes epidemic. The battle must begin.