Well, America, we're not #1 anymore.  

For years, the U.S. has held onto the top spot as the World’s Fattest Developed Nation.  But according to a new United Nations Food and Agricultural Organization (FAO) report, Mexico can now lay claim to that dubious title.

The report found that 32.8 percent of Mexican adults are now obese. That just edges out the 31.8 percent obesity rate listed for Americans.  

That makes Mexico the most obese country in this half of the world and one of the fattest countries on the planet. According to the report, several Pacific Island countries and territories have even higher obesity rates. Nauru (71.1 percent), the Cook Islands (64.1 percent) and the Marshall Islands (46.5 percent) all have obesity rates well above those found in either Mexico or the United States.  But as far as developed nations go, Mexico wins top honors.

According to experts, Mexico's new claim to fame is bittersweet proof of increasing wealth and better access to food for the nation's citizens. Health experts estimate that Mexico's rise in obesity is directly related to the nation's access to cheap sugary drinks and mass-marketed processed foods -- two major changes in a diet that revolved not that long ago around fresh fruits and vegetables. And those dietary changes paired with a more sedentary lifestyle, combine to create major health problems such as childhood obesity and increased rates of heart disease and diabetes for adults.

Mexico gains top spot as world's fattest nation
Mexico surpasses the U.S. in the global battle for "most obese nation."