The world produces enough food to feed everyone. World agriculture produces 17 percent more calories per person today than it did 30 years ago, despite a 70 percent population increase. This is enough to provide everyone in the world with at least 2,720 kilocalories (kcal) per person per day (FAO 2002, p.9). The principal problem is that many people in the world do not have sufficient land to grow, or income to purchase, enough food. Poverty is the principal cause of hunger. The causes of poverty include poor people’s lack of resources, an extremely unequal income distribution in the world and within specific countries, conflict, and hunger itself.
Source: World Hunger Facts 2009