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Students eat their lunch in front of their classroom at Letefoho village, Ermera district, East Timor, on Tuesday. Schools in East Timor provide free lunch for students. Image Credit: Reuters

Chicago Cleaning your plate may not help feed starving children today, but the time-worn advice of mothers everywhere may help reduce food waste from the farm to the fork, help the environment and make it easier to feed the world's growing population.

Hard data is still being collected, but experts at the Reuters Food and Agriculture Summit in Chicago this week said an estimated 30 per cent to 50 per cent of the food produced in the world goes uneaten.

The average American throws away 15kg of food each month — about $40 (Dh146) worth — according to the Natural Resources Defence Council, which plans to publish a report on food waste in April. In a year, that means each person throws away almost 181kg of food, the weight of an adult male gorilla.

Trashed eggs

The US Department of Agriculture estimates that 23 per cent of eggs and an even higher percentage of produce ends up in the trash.

"We forget we have all these fresh fruits and vegetables, and at the end of the week we have to throw them away," said Esther Gove, a mother of three young children in South Berwick, Maine. "Now, I don't buy as much fresh produce as I used to."

But the impact of food waste stretches far beyond the kitchen.

Agriculture is the world's largest user of water, a big consumer of energy and chemicals and major emitter of greenhouse gases during production, distribution and landfill decay.

Experts say reducing waste is a simple way to cut stress on the environment while easing pressure on farmers, who will be called on to feed an expected nine billion people around the world in 2050, versus nearly seven billion today.

"No matter how sustainable the farming is, if the food's not getting eaten, it's not sustainable and it's not a good use of our resources," Dana Gunders, a sustainable agriculture specialist at the NRDC, said.