The UN's Food and Agriculture Organisation (FAO) food price index -- a measure of the monthly change in international prices of a basket of food commodities -- averaged 199.1 points in September.
Showing a drop of 2.3 points or 1.0 per cent from August, the composite food price index is down by 5.4 per cent from the beginning of the year.
The decline was due to the drop in the cereal price sub-index, which dropped 12.9 points, or by 6 per cent, from August to stand at 197.7 points in September. Cereals prices are down 25 per cent from one year ago.
The organisation trimmed its world cereal production forecast by 3 million tonnes to 2,489 million tonnes, which is still represents an 8.0-per cent increase from the level last year.
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Global cereals consumption is forecast at 2,415.5 million tonnes, with stocks expected to hit their highest level since 2001-2002 at 559 million tonnes.
The other FAO food sub-indices: dairy, oils, meat and sugar, rose slightly.
Sugar prices showed the biggest monthly increase, of 1.8 per cent, due to unfavourable weather conditions hampering the harvest in Brazil, the world's top producer and exporter.