Ubaldo Alexis Garcia Lopez, a 10-year-old Mexican boy, with his mother, is being treated by doctors and put on oxygen machine for symptoms related to mordid obesity at the emergency room in the Federico Gomez Childrens Hospital in Mexico City, Mexico on May 20, 2011. Ubaldo weighs 170 pounds and is 145 centimeters tall. He has a BMI of 36,5 and was diagnosed with chronic severe obstructive sleep apnea hypopnea, Metabolic Syndrome X and acanthosis nigricans. Ubaldo is a young student from a family living in Iztapalapa, one of the poorest areas in the Mexican capital. The poor in Mexico have a difficult time accessing preventive health care and education about unhealthy food. There is a high prevalence of obesity among the poor in Mexico. Obesity has reached epidemic proportions globally. Mexico has one of the highest obesity rates in the world, and public health officials are increasingly alarmed by the rapid rise in child and youth obesity. Mexico holds the first place worldwide in childhood obesity. About one-third of children in Mexico are now classified as either overweight or obese. This is the highest rate in the world, even higher than in the United States - which historically had the highest rate. Also, diabetes, of which obesity is a contributing factor, has become the No. 1 cause of death in Mexico. Photograph by Bénédicte Desrus