Recent research from leading universities reveals that the healthiest foods for our bodies also have the lowest environmental impacts—and unhealthy options do the most harm.
Past studies have separately examined foods' effects on human health or their environmental footprint. Now, experts from the University of Minnesota and Oxford University have bridged the gap in a comprehensive analysis of 15 food groups, published in the prestigious journal PNAS.
The findings are clear: Nutrient-rich foods like whole grains, fruits, vegetables, legumes, nuts, and olive oil—proven to support health—also produce minimal environmental damage, from greenhouse gas emissions to land use and water consumption.
In contrast, red and processed meats, linked to serious health risks, consistently show the highest environmental burdens.
“The foods that make up our diet have a big impact on ourselves and our environment. This study shows that eating healthier also means eating more sustainably,” says David Tilman, lead author and renowned ecologist.
Two notable exceptions: Fish, often seen as healthy, has moderate environmental effects due to overfishing and aquaculture. Sugary drinks, unhealthy as they are, have a surprisingly low footprint.
Overall, the researchers conclude that widespread adoption of healthier diets would boost public health while safeguarding the planet.
“It's important that we all think about the health effects of the foods we eat,” they note. “We now know that making our nutrition a priority will also pay off for the Earth.”
These insights align with the IPCC's October report, which stressed that curbing global warming requires overhauling food systems. Agriculture and livestock account for nearly a quarter of greenhouse gas emissions.
The IPCC urged innovations to sustain soils, cut fertilizer and freshwater use, reduce meat consumption, and promote plant-based diets that demand far less water and resources.
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