The Rome-based UN Food and Agriculture Organization (FAO) is expressing concern on food safety in many of the world's countries and has suggested improvements on two major fronts: street food and food additives. On street food, the agency says: "Originally derided as unhygienic and often discouraged, the convenience and rapid spread of street vending has helped institutionalise it." While exact numbers are not known, there are millions of vendors worldwide and an estimated two and a half billion people worldwide consume street foods.