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Diet change -- A solution to reduce water use?
Date:8/4/2014

Eating less meat would protect water resources in dry areas around the world, researchers at Aalto University in Finland have found.

Reducing the use of animal products can have a considerable impact on areas suffering scarce water resources, as meat production requires more water than other agricultural products.

Diet change together with other actions, such as reduction of food losses and waste, may tackle the future challenges of food security, states researcher Mika Jalava from Aalto University in Finland.

Growing population and climate change are likely to increase the pressure on already limited water resources and diet change has been suggested as one of the measures contributing to adequate food security for growing population.

The researchers assessed the impact of diet change on global water resources over four scenarios, where the meat consumption was gradually reduced while diet recommendations in terms of energy supply, proteins and fat were followed. The study published in Environmental Research Letters is the first global-scale analysis with a focus on changes in national diets and their impact on the blue and green water use of food consumption.

Food supply for growing population

Global population is expected to exceed 9 billion by 2050, adding over 2 billion mouths to be fed to the current population, according to the UN. By reducing the animal product contribution in the diet, global green water (rainwater) consumption decreases up to 21 % while for blue water (irrigation water) the reductions would be up to 14 %. In other words, by shifting to vegetarian diet we could secure adequate food supply for an additional 1.8 billion people without increasing the use of water resources. The potential savings are, however, distributed unevenly, and even more important, their potential alleviation on water scarcity varies widely from country to country.

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Contact: Mika Jalava
mika.jalava@aalto.fi
358-405-065-696
Aalto University
Source:Eurekalert  

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