Some countries have already been successful in the fight against hunger which affects more than one billion people worldwide, the United Nations food agency said Tuesday. Sixteen countries have already reached the goal of reducing hunger levels by 50 percent by 2015, according to a report by the Food and Agriculture Organization (FAO) published at a world hunger summit in Rome organized by the agency. Among those to have hit the target are China, Brazil, Nigeria, Thailand, Armenia, Georgia, Vietnam, and Peru. FAO chief Jacques Diouf hailed the news which he said was a result of "unflagging commitment on the part of governments of developing countries themselves and energetic support by the international community." The FAO said success in fighting hunger could be achieved through such factors as a favorable economic environment, targeted investment and sensible planning for the future. There are one billion hungry people in the world, according to U.N. figures, with six million children dying from hunger every year.