How did fast food become so successful?

From America to Mongolia, you can go into a restaurant run by a global fast-food chain, and buy the same meal. So how did fast food become so successful? Across the world, last year we spent more than 900 billion dollars on fast food. The USA, where it all began, consumes the most, but even in France, despite its history of haute cuisine, more than half of households regularly enjoy burgers and fries. Julia Paul learns about its origins in the USA, and hears how it spread globally, thanks to the franchise model. She speaks to a superfan who’s eaten at one chain in 25 countries. Critics say global brands shipping food around the world is bad for the environment and for local economies. There are some places where some brands have failed, and some where they haven’t even opened yet. Julia hears how local burgers, and the worldwide recession, saw off McDonalds in Iceland, and speaks to a Nigerian female chef who’s competing to offer fast local food in Lagos. If you would like to get in touch with the programme, email thefoodchain@bbc.co.uk. Presented and produced by Julia Paul. (Image: A large burger. Credit: Getty Images/BBC)