Rising rice and global food prices have stoked food security concerns. In some places, that's led to protests and concerns that the escalating costs of staple foods may increasingly influence social and political stability.

Some Asian nations have taken action in the face of rising rice prices and debate over food security. India has restricted some rice exports, Indonesia has raised taxes on palm oil shipments, and Malaysia is building up rice stocks.

Rising global food prices have already caused political fallout; one analyst, in an United Press International editorial, says that Pakistan's food ration cards contributed to the unpopularity of President Pervez Musharraf.

In Asia this week, rice prices surged to a 20-year high in the latest sign of global food inflation. Governments are concerned that rice shortages will strain social cohesion, possibly leading to social unrest. Economists such as Nobel laureate Amartya Sen have described rice as a critical component of food and overall human security in developing countries in Asia. The rising prices may create policy challenges in Asia, reports the Financial Times.

Rice prices in Thailand, a global benchmark, rose last week above the level of $500 a metric ton for the first time since 1989, according to the United Nations Food and Agriculture Organization, pushing importing countries to seek assurances on supplies. Robert Ziegler, director at the International Rice Research Institute in Manila cautioned policymakers.

"If history is any indicator, we should be worried because rice shortages have in the past led to civil unrest," he said....

Asia has not known famines since the 1970s, and recent prices for rice and other basic foodstuffs have sparked unrest.

In the Philippines, consumer prices rose at the fastest pace in 16 months in February, driven by rising food prices, Bloomberg reports. Prices of rice, corn, pork, and cooking oil rose last month, according to the Filipino Bureau of Agricultural Statistics. Food prices accounted for half of the price rise.

Rising oil and food prices in the Philippines has led to overall cost of living increases that have driven nearly 4 million people back into poverty, Agence France-Presse reports. The number of Filipinos living on just a dollar a day rose from 23.8 million in 2003 to 27.6 million in 2006, according to a survey from the Economic Planning Ministry. Overall prices rose by 22 percent between 2003 and 2006.

The Philippines said Tuesday that it had called on Vietnam to guarantee rice shipments in a sign of rising global anxiety over how nations could feed their people, Reuters reports. Philippines' president, Gloria Arroyo, contacted Vietnamese Prime Minister Nguyen Tan to see if he could pledge an undisclosed supply of rice. Mrs. Arroyo appears to be the first leader to take an overtly political route to dispel the worries of her fast-growing population.

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