Eating better was associated with more food wasted and more irrigation water used to grow it
A U.S. estimate found that producing discarded food required less land but more water and pesticides.
The key idea
What is left on the plate carries land, water, and pesticides that were already used before it reached your kitchen.
The study, in plain language
No household trash was weighed. Researchers started with what more than 35,000 people reported eating, applied food-waste rates, and combined this with an agricultural model estimating the land, irrigation water, and pesticides needed to produce it. They estimated that about 420 grams of food per person per day was discarded in the United States from 2007 to 2014.
The relationship appeared when waste was compared with diet quality: higher quality was associated with more discarded food. Producing that food required less cropland, but more irrigation water and pesticides. Much of this was related to fruits and vegetables, which use less land and more of those inputs than other crops. The model did not measure pesticide residues in food; it only estimated how much was used to produce it.
What they found
- Fruits, vegetables, and dishes combining them made up a substantial share of food waste by weight.
- Higher diet quality was associated with more estimated waste, with less cropland but more irrigation water and pesticides behind it.
- Discarded food was estimated using waste rates and people’s reported diets. Household trash was not weighed.
How they studied it
Researchers combined reported diets from 35,507 people in the United States with waste rates and an agricultural production model. They estimated the land, irrigation water, and pesticides needed to produce discarded food. This was a model-based calculation, not an experiment with randomly assigned groups.
What the study cannot show
- Waste was estimated using general rates, includes cooking losses, and assumes U.S. domestic production. It is not a measurement of each household’s trash.
Something to think about
The next time you throw something from the fridge away, think about what it took to get it there. The water and land behind it are invisible in the bin.
The original study
Relationship between food waste, diet quality, and environmental sustainability
Source under CC0 1.0. English adaptation and explanation by PaperFlow, with AI assistance. The text has been reorganized for a general audience; it is not the complete paper and does not imply endorsement by its authors.
One study alone does not represent a field's consensus. Educational content does not replace professional advice. Report a possible error.
