Another article which explains why food prices are going up. From the Christian Science Monitor:
Two major trends have been pushing prices up faster than they have risen for more than 30 years. One is that increasingly prosperous consumers in India and China are not only eating more food but eating more meat. Animals have to be fed (grains, usually) before they are butchered. The other is that more and more crops – from corn to palm nuts – are being used to make biofuels instead of feeding people.