The U.N. food agency says one-third of all food produced in the world gets wasted, amounting to a loss of $750 billion a year. The Rome-based Food and Agricultural Organisation said in a report on Wednesday that food in developing countries is wasted mostly due to poor harvesting techniques, while in high-income areas the primary cause of waste is careless consumer behaviour. The most serious areas of waste are of cereals in Asia and meat in wealthy regions and Latin America.