Would a tax on sugary drinks make Mexico healthier?

A controversial tax on soft drinks is currently being debated in Mexico's Congress.

But can a tax really reduce the nation's waistlines?

Over a third of Mexican adults are overweight, putting them way up the global league tables for obese nations.

A possible cause is found in another of Mexico's dubious honours - being the world's biggest consumer of soft drinks.

Now the government is proposing a controversial new step: a tax of eight US cents on every litre of sugary drink.

Juan Carlos Perez Salazar reports from Mexico City.