Talk by Professor Charles Godfray, Director, Oxford Martin Programme on the Future of Food. The global food system is undergoing a significant phase change that will see an end to the historically low food prices that we have experienced over the last four decades. Challenges on both the supply and demand side suggest that if current trends and practices continue we shall see very significant increases in food prices with threats to the sustainability of food production and particular harm to the world's poorest. This talk explores how food supply, food demand, and food system efficiency and governance needs to change to meet these challenges. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/