"Price increases in both oil and food provide textbook examples of market forces. Rapid expansion in the big emerging markets, especially China, has led to an increase in demand at a time when there have been supply constraints. For crude, these have included the war in Iraq, the embargo imposed on Iran, and the fact that some of the older fields are starting to run dry before new sources of crude are opened up.
The same demand dynamics affect food. It is not just that the world's population is rising by 1% a year. Nor is it simply that China has been growing at 9% a year on average; it is that consumers in the big developing countries have developed an appetite for higher protein western diets. Meat consumption is rising in China, India and Brazil, and since it takes 7kg of grain to produce 1kg of beef (and 4kg to produce 1kg of pork), this is adding to global demand."
Peak food. – JO