In Mexico, authorities are trying to buck the worrying rise in obesity among young people. Some 73 percent of the country's population is overweight, with 29 percent of the nation said to be actually obese: one of the highest rates in the world. In one southern state, authorities have decided to outlaw the sale of junk food to minors, with the aim of slimming down youngsters. Our correspondents Laurence Cuvillier and Matthieu Comin report.

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