World food prices were down for the seventh straight month in February as falling cereal prices outweighed more costly sugar and meat, the Food and Agricultural Organization (FAO) said Friday.

The United Nations agency said its FAO Food Price Index dropped 0.7% in February and is down 10.5% from a year ago.

The index averaged 117.3 points in February, down from a revised 118.2 points the previous month, the agency said.

The FAO index measures commodity market prices, and it can take a while for these to filter through to supermarket shelves. They represent only a fraction of the cost of processed final products.

Cereals alone plunged 5% during the month and 22.4% from February last year, driven lower by corn "amid expectations of large harvests in South America and competitive prices offered by Ukraine," the FAO said.

Wheat was pulled lower by stronger Russian exports and rice prices also fell.

Vegetable oils also largely fell due to abundant harvests in South America.

Sugar, however, rose 3.2% during the month because of dry weather in Brazil.

The meat index rose 1.8% during the month as heavy rains disrupted cattle transportation in Australia and Chinese demand for pork grew amid tight supplies in Europe.