We are experiencing a global crisis due to high food prices.  Food prices are a critical aspect of the conditions of poor populations and have been linked to social unrest.  Here we provide a map showing the dependence of different countries on the three most produced grains -- corn, rice, and wheat. 
The map shows proportions of consumption of the three grains. Each grain is assigned a color -- wheat is green, corn is red, and rice is blue -- and each country is colored according to its ratio of domestic consumption of these three grains. For example, the consumption of corn in the U.S. dominates the other two grains, and this is visible in the red color of the country. In contrast, India has a mix of wheat and rice, leading to a blue-green, and China has a mix of all three grains, leading to a shade of purple. The countries for which data is not available are shown in white.
 Food and Agriculture Organization of the United Nations, The state of food insecurity in the world: Addressing food insecurity in protracted crises (FAO, Rome, Italy, 2010).
 M. Lagi, K.Z. Bertrand, Y. Bar-Yam, The Food Crises and Political Instability in North Africa and the Middle East. arXiv:1108.2455, August 10, 2011.
 U.S. Department of Agriculture (http://www.usda.gov/)