Wasted: 40 Percent of Food

Photo by by lyzadanger, courtesy Wikimedia Commons

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Americans, obviously, are eating more than ever before. A new study suggests we’re also throwing away more than ever before. About 50 percent more per person since 1974.

According to the new calculations, food waste contributes to greenhouse gas emissions in the form of methane and CO2 from decomposing food. In the US, it also accounts for:

  • More than one-quarter of total freshwater use
  • Some 300 million barrels of oil a year (~4 percent of total American oil consumption)

Until now, studies of food waste have depended on interviews with consumers and inspections of garbage. Neither is particularly accurate.

In this study, researchers analyzed the amount of food consumed by tracking average body weight in the US from 1974 to 2003. They assumed that exercise levels hadn’t changed in that period (an admittedly conservative approach). They compared these data with estimates of the total food available in the US as reported by the USDA to the Food and Agriculture Organization of the UN.

The difference between calories available and calories consumed (what the researchers call the missing mass of American food) equals food wasted. Here’s how it breaks down per person per day in 2003:

  • 3750 calories available
  • 2300 consumed
  • 1450 wasted

That’s 39 percent of the American food supply that is never consumed by human beings. Multiply the individual waste by 300 million Americans and you get enough to feed the people of the Philippines.

The 39-percent estimate significantly exceeds the 27-percent estimate of the USDA, based on consumer and producer interviews.

The new study is out of the Laboratory of Biological Modeling, National Institute of Diabetes and Digestive and Kidney Diseases, in Maryland. The paper is open access at PLoS ONE.

A little something to chew on as we head to Copenhagen.
 

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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