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Food prices - for meat, dairy, sugar and cereals - have slumped to a four-year low, despite the costs of production, processing, and transport going up. So, how can food be priced so cheaply?

In the US, Americans eat more 31% less fresh food than processed food, Europe buys half the world's market for frozen pizza and China's market for cookies is thought to be more than $24 billion. Convenience, income, supply and business models have all influenced the demand and supply for cheap processed food, but what impact is this having on people's health?

'Cheap' means different things depending on your income. We'll explore how tastes change as developing nations get richer.