Childhood obesity: South Africa's campaigners for healthy food

The UN says the number of obese teenagers has nearly tripled globally in the last two decades.

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Dozens of children line up excitedly in front of a table laden with large pots of fresh, hot food.

"Today on the menu we have kitchari - a mix of daal and rice, with tomato chutney, halloumi and salad," the school cook says, as she serves the students.

The school decided to introduce a mainly vegetarian food policy as part of an effort to buck a worrying global trend: for the first time, the number of overweight children has overtaken the number of underweight ones.

The UN says the number of overweight and obese teenagers around the world has nearly tripled in the last two decades.