Future diets: obesity rising to alarming levels around the world

There has been a dramatic increase in the numbers of overweight or obese people in the past 30 years. Previously considered a problem in richer countries, the biggest rises are in middle income countries and the developing world.

Hanging meats. Source: flickr/Jose Gonzales

'Future Diets' traces how the changes in diet - more fat, more meat, more sugar and bigger portions - have led to a looming health crisis.  It also looks at how policy-makers have tried to curb our eating excesses - with mixed results.