Mexico Overtakes U.S. As World's Most Obese Nation

The United States is no longer the world's most obese developed nation.

According to the United Nations, Mexico now holds that title by using the latest data from 2008.

But it's not that the U.S. is getting skinnier. Instead, Mexico is getting fatter.

The study says nearly a third of adults in Mexico are obese.

The U.N. blames the increase on rising income and the growing urban lifestyle.

The U.S. remains 2nd on the list.