US Isn't World's Fattest Country— But It's Close Almost a third of Mexicans obese By Matt Cantor, Newser User Posted Jul 11, 2013 8:06 AM CDT 22 comments Comments Mexico is the world's most overweight country. (Shutterstock) (Newser) – Amid near-constant news of the obesity epidemic, you'd be forgiven for thinking the US led the developed world when it comes to weight—but by at least one measure, you'd be wrong. Mexico actually has a higher percentage of obese adults, with 32.8% of its grown-up population meeting the description, a UN report finds. The US isn't far behind, however, with 31.8% of adults considered obese. In Mexico, some 70% of adults are overweight, al-Jazeera notes. Keeping fit isn't easy for Mexican children in particular, who face both obesity and malnourishment, CNN reports. "They are exposed to high-fat, high-sugar, high-salt, energy-dense ... foods, which tend to be lower in cost but also lower in nutrient quality," says the World Health Organization. Amid climbing incomes and shifts to city life, Mexico is also seeing a more sedentary lifestyle among its population. Across the planet, obesity has doubled since 1980.