Sustainable diets for the future: Can we contribute to reducing greenhouse gas emissions by eating a healthy diet?
- PMID: 22854399
- DOI: 10.3945/ajcn.112.038729
Sustainable diets for the future: Can we contribute to reducing greenhouse gas emissions by eating a healthy diet?
Abstract
Background: Food systems account for 18-20% of UK annual greenhouse gas emissions (GHGEs). Recommendations for improving food choices to reduce GHGEs must be balanced against dietary requirements for health.
Objective: We assessed whether a reduction in GHGEs can be achieved while meeting dietary requirements for health.
Design: A database was created that linked nutrient composition and GHGE data for 82 food groups. Linear programming was used iteratively to produce a diet that met the dietary requirements of an adult woman (19-50 y old) while minimizing GHGEs. Acceptability constraints were added to the model to include foods commonly consumed in the United Kingdom in sensible quantities. A sample menu was created to ensure that the quantities and types of food generated from the model could be combined into a realistic 7-d diet. Reductions in GHGEs of the diets were set against 1990 emission values.
Results: The first model, without any acceptability constraints, produced a 90% reduction in GHGEs but included only 7 food items, all in unrealistic quantities. The addition of acceptability constraints gave a more realistic diet with 52 foods but reduced GHGEs by a lesser amount of 36%. This diet included meat products but in smaller amounts than in the current diet. The retail cost of the diet was comparable to the average UK expenditure on food.
Conclusion: A sustainable diet that meets dietary requirements for health with lower GHGEs can be achieved without eliminating meat or dairy products or increasing the cost to the consumer.
Comment in
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The challenges of eating a healthy and sustainable diet.Am J Clin Nutr. 2012 Sep;96(3):459-60. doi: 10.3945/ajcn.112.044487. Epub 2012 Aug 8. Am J Clin Nutr. 2012. PMID: 22875711 No abstract available.
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Defining "sustainable" and "healthy" diets in an era of great environmental concern and increased prevalence of chronic diseases.Am J Clin Nutr. 2013 May;97(5):1151-2. doi: 10.3945/ajcn.112.057505. Am J Clin Nutr. 2013. PMID: 23604436 No abstract available.
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Reply to I Hawkins and J Sabaté.Am J Clin Nutr. 2013 May;97(5):1152-3. doi: 10.3945/ajcn.113.058305. Am J Clin Nutr. 2013. PMID: 23734374 No abstract available.
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