London ? Evoking an era of World War II austerity, British families are being urged to cut food waste and use leftovers in a nationwide effort to fight sharply rising global food prices.

It’s not back to ration books, “victory gardens” or squirrel-tail soup yet, but warning bells are being rung by experts at all levels of Britain’s government as well as from the World Food Program.

With food and energy prices soaring around the world, a constant supply of high-quality, affordable food is no longer guaranteed, the officials are warning Britons. That could mean an era of scarcity like Britain’s 1940-54 food rationing, during the war and its aftermath.

“Well, of course, in the war years it was not only immoral to waste food – this was one of our slogans then – it also was illegal,” said Marguerite Patten, 92, who worked at the Ministry of Food during World War II and urges a return to those more thrifty days.

“I know it’s old fashioned, but some old-fashioned things are worth doing,” she said.

During the war, Nazi Germany’s U-boats crippled the flow of ships carrying food to Britain. Diets were tightly controlled by rationing. Bananas and pineapples became exotic treats, and enterprising housewives traded recipes for baked hedgehog and carrot fudge.

The experts say the postwar era of cheap food has ended – squeezed by the demands of a growing world population, a greater appetite for meat among emerging middle classes in China and India and the pressure on agricultural land from biofuel production.

“Recent food price rises are a powerful reminder that access to ever more affordable food cannot be taken for granted,” Prime Minister Gordon Brown said in a foreword to a bleak new report by Britain’s Cabinet Office.

The report says the task of feeding a larger, richer world population – while simultaneously tackling climate change – is far greater than imagined. The World Bank estimates the cost of food staples has risen 83 percent in three years.

Tim Lang, professor of food policy at London’s City University, said junk food will remain readily available, but good-quality, nutritious produce could become scarce worldwide.

“There has been 60 years of silence on this issue,” he said. “We haven’t had any sort of overview of food policy since the end of the Second World War. I think we need to accept that food is once again in a wartime state.”