World food prices rose to a record in December on higher sugar, grain and oilseed costs, the United Nations said, exceeding levels reached in 2008 that sparked deadly riots from Haiti to Egypt.

An index of 55 food commodities tracked by the Food and Agriculture Organization gained for a sixth month to 214.7 points, above the previous all-time high of 213.5 in June 2008, the Rome-based UN agency said in a monthly report. The gauges for sugar and meat prices advanced to records.

Sugar climbed for a third year in a row in 2010, and corn jumped the most in four years in Chicago. Food prices may rise more unless the world grain crop increases “significantly” in 2011, the FAO said Nov. 17. At least 13 people died last year in Mozambique in protests against plans to lift bread prices.