Organic food offers significant environmental benefits, but only to plant-rich diets: study

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12 Feb 2018 --- A diet rich in fruit and vegetables is better for the planet than one rich in animal products, with organic food providing significant additional climate benefits for plant-based diets, a major new study has confirmed. However, these additional benefits do not extend to diets with only moderate contribution from plant products. Published last week in the journal Frontiers in Nutrition, this is the first study to investigate the environmental impacts of both dietary patterns and farm production systems. It is also the first to investigate the environmental impact of organic food consumption using observed diets rather than models.

Many organizations, including the UN's Food and Agriculture Organization, advocate the urgent adoption of more sustainable diets at a global level. Such diets include reduced consumption of animal products, which have a higher environmental impact than plant-based products. This is mainly due to the high energy requirements of livestock farming as well as the very large contribution of livestock to greenhouse gas emissions. 

The method of food production may also influence sustainable diets. Organic agriculture is generally considered more environmentally friendly than other modern production techniques. However, while many studies have investigated environmentally sustainable diets, these have rarely considered both dietary choices and the production method of the foods consumed.

“We wanted to provide a more comprehensive picture of how different diets impact the environment,” says Louise Seconda from the French Agence De L'Environnement Et De La Maitrise De L'Energie and the Nutritional Epidemiology Research Unit, one of the article's authors. “In particular, it is of considerable interest to consider the impacts of both plant-based foods and organic foods.”

Researchers obtained information on food intake and organic food consumption from more than 34,000 French adults. They used a so-called “provegetarian” score to determine preferences for plant-based or animal-based food products. The researchers also conducted production life cycle environmental impact assessments at the farm level against three environmental indicators: greenhouse gas emissions, cumulative energy demand and land occupation.

“Combining consumption and farm production data we found that across the board, diet-related environmental impacts were reduced with a plant-based diet – particularly greenhouse gas emissions,” says Seconda. “The consumption of organic food added even more environmental benefits for a plant-based diet. In contrast, consumption of organic food did not add significant benefits to diets with a high contribution from animal products and only moderate contribution from plant products.”

However, the researchers warn that the environmental effects of production systems are not uniform and can be impacted by climate, soil types and farm management.

As the researchers did not look at other indicators relevant to the environmental impacts of productions systems, such as pesticide use, leaching and soil quality, Seconda comments that future studies “could also consider these as well as supply chain and distribution impacts of food production.”

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