Five meals a week: Scientists audit garbage to assess household food waste

Average weekly waste represented enough calories to feed an adult five nights a week

In this Aug. 29, 2018, photo, at the Waste Management facility in North Brooklyn, tons of leftover food sits piled up before being processed into “bio-slurry,” in New York. A team of scientists spent weeks combing through the garbage of dozens of households to come up with what they say is the most accurate measure yet of how much food is wasted in Canadian kitchens. (THE CANADIAN PRESS/AP/Stephen Groves)

Scientists spent weeks up to their elbows in coffee grounds and banana peels to come up with what they say is the most accurate measure yet of how much food is wasted in Canadian kitchens.

“To be honest, it’s not something you’d want to do forever,” said Michael von Massow, a food economist at the University of Guelph.

Food waste has become an increasingly hot research topic in recent years.

Previous efforts have relied on industry data or household self-reporting to assess how much uneaten food goes in the garbage. But people underestimate how much they chuck and industry figures provide little detail on individual homes.

The only way, von Massow thought, was to get down and dirty.

He and his research colleagues worked with 94 households in Guelph, Ont.. The scientists took out the trash, went through recycling, organic waste and composting, separated mushy asparagus from dubious rice and weighed it all out over the course of several weeks.

“Rubber gloves,” von Massow laughs. “It’s not as bad as you might think.”

Items commonly dumped down the sink, such as expired milk or mouldy yogurt, weren’t measured.

The detailed, teabag-by-applecore approach allowed von Massow to precisely measure just how much was thrown out and whether it was once edible. That was crucial for determining the value of what got tossed.

“If you have a T-bone steak and you throw that bone out, putting a value on that bone of whatever you paid for the steak seems inaccurate,” von Massow said.

READ MORE: Save-On-Foods commits to reducing food waste

Waste from the families, all of whom had young children, varied widely. Some threw out up to eight kilograms of once-edible food a week, some barely one-sixteenth of that. The median figure was 2 1/2 kilograms.

That represents enough calories to have an adult over for dinner five nights a week without adding a dime to the grocery bill.

The value of that food was about $18. Producing and disposing of it generated about 23 kilograms of greenhouse gases.

Bread, tomatoes and apples were the top three items. Chicken was the most frequent meat.

Von Massow’s figures are lower than those arrived at in some previous research. A 2017 study estimated the amount of avoidable food waste in Canada at 2.7 kilograms per household.

Von Massow attributes that to his exclusion of non-edible waste.

Going through the garbage was revealing, he said. People know the plastic wrap around that yucky cucumber should go in the recycling, but they toss it in the trash anyway.

“People hide things that they feel guilty about. I saw people hide batteries in a Pringles tube. They know they’re doing something they shouldn’t and I think the same thing happens with avoidable food waste.”

Von Massow acknowledges that his sample size is small and, to some extent, self-selecting. But he maintains his results are, if not statistically bulletproof, at least representative.

The point of the research, he said, is to eventually understand what works best to persuade people to cut down on food waste. For some, it’s an ethical issue. For others, it’s economic and for still others it’s an environmental problem.

For von Massow, spending weeks picking through garbage has already had one effect.

“We have not audited my house yet, but it sure makes me more cognizant of when I’m putting something into the garbage.”

Bob Weber, The Canadian Press

READ MORE: KAPS hopes to get hands on handhelds under Save-On program

Like us on Facebook and follow us on Twitter

Just Posted

Rainbow Saddleback faces 15 break and enter related charges

Maskwacis, Wetaskiwin men charged by RCMP in relation to break and enters

Five things you should know about Impaired Driving

Too many risks, no rewards for impaired driving

Pigeon Lake re-zoning defeated by 2-5 county council vote

County of Wetaskiwin council denies Frank Dyck’s re-zoning

Special guest to city rocked a Wetaskiwin stage Aug. 31

From ferries to festivals, Jeremy Dallas known for entertaining audiences

Smoking fire safety tips, for both indoors and out

Prevention is easy with a bit of forethought

No holiday for campaigning leaders on Thanksgiving weekend, but pace slows

There is a little over a week to go before election day, and advanced polls are now open

PHOTOS: Kipchoge becomes first runner to dip under 2 hours for marathon

Olympic champion and world record holder from Kenya clocks 1 hour, 59 minutes and 40 seconds

Mourners gather for slain teenager’s funeral in Hamilton, Ont.

Devan Bracci-Selvey’s obituary says he also had ‘a loving heart for animals’

1/3 of Canadian men won’t share their feelings for fear of being ‘unmanly’: report

Fifty-nine per cent of men said society expects them to be ‘emotionally strong and not show weakness’

Dog owners have reduced risk of dying from heart problems, says researcher

Researchers analyzed data on more than 3.8 million people taken from 10 studies

Winterhawks ice Rebels 5-0

Rebels take on Medicine Hat on the road Saturday night

Deceased adult male recovered from Battle River in Ponoka

Incident not considered suspicious by RCMP

Yukon declares climate emergency

Territory joins nearly 500 federal, provincial and municipal governments to do so in the last year

Final debate behind them, federal leaders begin sprints to Oct. 21 voting day

The final stretch in the federal election campaign has begun

Most Read