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How to tackle Tonga's obesity crisis?

19 January 2016 Last updated at 01:31 GMT

The Pacific island of Tonga is the most obese country in the world but its government is trying to tackle the problem.

Up to 40% of the population is thought to have diabetes and life expectancy is falling.

One of the main causes is a cheap, fatty kind of meat - mutton flaps - imported from New Zealand.

Katy Watson reports.