Deliveries of grain from Ukraine and Russia, which account for about a quarter of the world’s grains trade, are being disrupted due to the conflict.
World food prices hit an all-time high in March as Russia's conflict with Ukraine sent "shocks" through markets for staple grains and vegetable oils.
"World food commodity prices made a significant leap in March to reach their highest levels ever, as war in the Black Sea region spread shocks through markets for staple grains and vegetable oils," UN's Food and Agriculture Organization (FAO) said in a statement on Friday.
The disruption in export flows and international sanctions against Russia have spurred fears of a global hunger crisis, especially across the Middle East and Africa, where the knock-on effects are already playing out.
Russia and Ukraine, whose vast grain-growing regions are among the world's main breadbaskets, account for a huge share of the globe's exports in several major commodities, including wheat, vegetable oil and corn.
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The FAO's food price index, which had already reported a record in February, surged by 12.6 percent last month, "making a giant leap to a new highest level since its inception in 1990", the UN agency said.
The index, a measure of the monthly change in international prices of a basket of food commodities, averaged 159.3 points in March.
The jump includes new all-time highs for vegetable oils, cereals and meats, the FAO said, adding that prices of sugar and dairy products "also rose significantly".
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Russia and Ukraine together accounted for around 30 percent and 20 percent of global wheat and maize exports respectively, over the past three years, the FAO said.
The conflict continues to rage as sowing season has started in Ukraine.
Wheat prices rose by almost 20 percent, with the problem exacerbated by concerns over crop conditions in the United States, the organisation said.
The FAO's vegetable oil price index surged by 23.2 percent, driven by higher quotations for sunflower seed oil, of which Ukraine is the world's leading exporter.
Spanish supermarkets have rationed the sale of sunflower oil to stop customers stockpiling over shortage fears due to the conflict.
The United States has accused Russian President Vladimir Putin of creating "this global food crisis".
France has warned that the conflict has increased the risk of famine around the world.
The conflict has also sent oil and gas prices through the roof, causing inflation to rise further across the world and raising concerns that it could derail global economic growth.
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