PORT-AU-PRINCE, Haiti - It was lunchtime in one of Haiti's worst slums, and Charlene Dumas was eating mud.

With food prices rising, Haiti's poorest can't afford even a daily plate of rice, and some take desperate measures to fill their bellies.

Charlene, 16 with a 1-month-old son, has come to rely on a traditional Haitian remedy for hunger pangs: cookies made of dried yellow dirt from the country's central plateau.

The mud has long been prized by pregnant women and children here as an antacid and source of calcium. But in places like Cite Soleil, the oceanside slum where Charlene shares a two-room house with her baby, five siblings and two unemployed parents, cookies made of dirt, salt and vegetable shortening have become a regular meal.

"When my mother does not cook anything, I have to eat them three times a day," Charlene said. Her baby, named Woodson, lay still across her lap, looking even thinner than the slim 6 pounds 3 ounces he weighed at birth.

Though she likes their buttery, salty taste, Charlene said the cookies also give her stomach pains. "When I nurse, the baby sometimes seems colicky too," she said. Food prices around the world have spiked because of higher oil prices, needed for fertilizer, irrigation and transportation. Prices for basic ingredients such as corn and wheat are also up sharply, and the increasing global demand for biofuels is pressuring food markets as well.

At the market in the La Saline slum, two cups of rice now sell for 60 cents, up 10 cents from December and 50 percent from a year ago. Beans, condensed milk and fruit have gone up at a similar rate, and even the price of the edible clay has risen over the past year by almost $1.50. Dirt to make 100 cookies now costs $5, the cookie makers say.

Still, at about 5 cents apiece, the cookies are a bargain compared to food staples.

Merchants truck the dirt from the central town of Hinche to the La Saline market. Women buy the dirt, then process it into mud cookies. Carrying buckets of dirt and water up ladders to the roof of the former prison for which the slum is named, they strain out rocks and clumps on a sheet, and stir in shortening and salt. Then they pat the mixture into mud cookies and leave them to dry under the scorching sun.

The finished cookies are carried in buckets to markets or sold on the streets.