The bank released a report Tuesday that said global food prices have jumped 29 percent in the past year, and are just 3 percent below the all-time peak hit in 2008. Bank President Robert Zoellick said the rising prices have hit people hardest in the developing world because they spend as much as half their income on food.

"Food prices are the key and major challenge facing many developing countries today," Zoellick said. The World Bank estimates higher prices for corn, wheat and oil have pushed 44 million people into extreme poverty since last June.

The report comes a day before Finance ministers and central bank chiefs from the Group of 20 leading economies meet in Paris. Zoellick said he's worried some countries might react to food inflation by banning exports or implementing price controls, which would just aggravate the problem.

The World Bank's food price index rose by 15 percent between October and January alone. The increase has been driven by volatile global trading in wheat, corn and soybeans. Global corn futures more than doubled since this summer, from $3.50 to $7 a bushel, in part because of higher demand from developing countries and a growing biofuels industry.