By 2023, the number of food-insecure people in the 76 countries included in this report is projected to increase nearly 23 percent to 868 million, slightly faster than population growth.  The distribution gap—the amount of additional food needed to bring people in all income deciles up to the nutritional target—is projected to increase 28 percent by 2023, meaning that food insecurity in these countries is expected to intensify over the next 10 years. Despite improvements over the years, Sub-Saharan Africa is projected to remain the most food-insecure region in the world.

USDA, 2013.

Online version of guide
http://reliefweb.int/sites/reliefweb.int/files/resources/International%20Food%20Security%20Assessment%202013-2023.pdf