Bloomberg Benchmark

The North American Free Trade Agreement has been labeled everything from an unfair deal for U.S. workers to a boon for commerce across the continent. Less well known is that it's helped cause a big expansion in Mexican waistlines. Simon Barquera, executive director of the Nutrition and Health Research Center at Mexico's National Institute of Public Health, explains the nation's rise in obesity to Scott Lanman and Bloomberg intern Shelly Hagan.