Fit Cities

Dr. Karen K. Lee is a force for good around the world, working behind the scenes to help people improve their diets, get in shape, and live longer. In the arena of public health, this Canadian woman is an international superstar. In the early 2000s, she went to the US to join a team of "health detectives" for the Centers for Disease Control and Prevention. Smoking was in decline, and so the US CDC's attention had turned to the next biggest causes of premature death: over-eating and under-exercis