New research from the University of North Carolina-Chapel Hill finds physical fitness around the globe is plummetting.
Asma Khalid: Sure, we may already know a lot of us Americans are overweight. But, the problems aren't limited to our borders. This study finds a growing number of people in the U.K., Brazil, India and China are less active than a generation ago. Barry Popkin is a nutrition professor at UNC and a co-author of the report.