Dietary greenhouse gas emissions of meat-eaters, fish-eaters, vegetarians and vegans in the UK
Tóm tắt
The production of animal-based foods is associated with higher greenhouse gas (GHG) emissions than plant-based foods. The objective of this study was to estimate the difference in dietary GHG emissions between self-selected meat-eaters, fish-eaters, vegetarians and vegans in the UK. Subjects were participants in the EPIC-Oxford cohort study. The diets of 2,041 vegans, 15,751 vegetarians, 8,123 fish-eaters and 29,589 meat-eaters aged 20–79 were assessed using a validated food frequency questionnaire. Comparable GHG emissions parameters were developed for the underlying food codes using a dataset of GHG emissions for 94 food commodities in the UK, with a weighting for the global warming potential of each component gas. The average GHG emissions associated with a standard 2,000 kcal diet were estimated for all subjects. ANOVA was used to estimate average dietary GHG emissions by diet group adjusted for sex and age. The age-and-sex-adjusted mean (95 % confidence interval) GHG emissions in kilograms of carbon dioxide equivalents per day (kgCO2e/day) were 7.19 (7.16, 7.22) for high meat-eaters ( > = 100 g/d), 5.63 (5.61, 5.65) for medium meat-eaters (50-99 g/d), 4.67 (4.65, 4.70) for low meat-eaters ( < 50 g/d), 3.91 (3.88, 3.94) for fish-eaters, 3.81 (3.79, 3.83) for vegetarians and 2.89 (2.83, 2.94) for vegans. In conclusion, dietary GHG emissions in self-selected meat-eaters are approximately twice as high as those in vegans. It is likely that reductions in meat consumption would lead to reductions in dietary GHG emissions.
Tài liệu tham khảo
Audsley E, Brander M, Chatterton J, Murphy-Bokern D, Webster C, Williams A (2009) How low can we go? an assessment of greenhouse gas emissions from the UK food system and the scope to reduce them by 2050. Food Climate Research Network & WWF, London, UK
Baroni L, Cenci L, Tettamanti M, Berati M (2007) Evaluating the environmental impacts of various dietary patterns combined with different food production systems. Eur J Clin Nutr 61:279–286
Bates B, Lennox A, Prentice A, Bates C, Swan G (2012) National diet and nutrition survey. Headline results from years 1, 2 and 3 (combined) of the rolling programme (2008/2009–2010/11). Department of Health, London, UK
Beccali M, Cellura M, Iudicello M, Mistretta M (2009) Resource consumption and environmental impacts of the agrifood sector: life cycle assessment of Italian citrus-based products. Environ Manag 43:707–724
Becker W, Welten D (2001) Under-reporting in dietary surveys – implications for development of food-based dietary guidelines. Public Health Nutr 4:683–687
Berkow S, Barnard N (2006) Vegetarian diets and weight status. Nutr Rev 64(4):175–88
Berlin J (2002) Environmental life cycle assessment (LCA) of Swedish semi-hard cheese. Int Dairy J 12(11):939–953
Berners-Lee M, Hoolohan C, Cammack H, Hewitt C (2012) The relative greenhouse gas impacts of realistic dietary choices. Energy Policy 43:184–190
Bingham SA, Gill C, Welch A, Day K, Cassidy A, Khaw KT, Sneyd MJ, Key TJA, Roe L, Day NE (1994) Comparison of dietary assessment methods in nutritional epidemiology: weighed records v. 24 h recalls, food-frequency questionnaires and estimated-diet records. Br J Nutr 72:619–643
Bingham SA, Cassidy A, Cole TJ, Welch A, Runswick SA, Black AE, Thurnham D, Bates C, Khaw KT, Key TJA et al (1995) Validation of weighed records and other methods of dietary assessment using the 24 h urine nitrogen technique and other biological markers. Br J Nutr 73:531–550
Briggs A, Kehlbacher A, Tiffin R, Garnett T, Rayner M, Scarborough P. Incorporating the societal cost of greenhouse gases into the price of foods could save lives from cardiovascular disease and cancer in England: a comparative risk assessment modelling study. BMJ Open, 2013 (in press)
Carbon Footprint. Carbon footprint calculator. www.carbonfootprint.com/calculator.aspx Accessed July 2013.
Carlsson-Kanyama A, Gonzalez A (2009) Potential contributions of food consumption patterns to climate change. Am J Clin Nutr 89:1S–6S
Committee on Climate Change (2010) The fourth carbon budget. Reducing emissions through the 2020s. Committee on Climate Change, London, UK
Copella. Copella fruit juices. http://www.copellafruitjuices.co.uk/our-juices/juices Accessed July 2013.
Crowe F, Appleby P, Travis R, Key T (2013) Risk of hospitalization or death from ischemic heart disease among British vegetarians and nonvegetarians: results from the EPIC-Oxford cohort study. Am J Clin Nutr 97:597–603
Davey G, Spencer E, Appleby P, Allen N, Knox K, Key T (2003) EPIC-Oxford: lifestyle characteristics and nutrient intakes in a cohort of 33,883 meat-eaters and 31,546 non meat-eaters in the UK. Public Health Nutr 6:259–269
de Vries M, de Boer I (2010) Comparing environmental impacts for livestock products: a review of life cycle assessments. Livest Sci 128:1–11
Ferdowsian H, Barnard N (2009) Effects of plant-based diets on plasma lipids. Am J Cardiol 104(7):947–56
Foley J, Ramankutty N, Brauman K, Cassidy E, Gerber J, Johnston M et al (2011) Solutions for a cultivated planet. Nature 478:337–342
Food and Agriculture Organization. FAOSTAT. http://faostat3.fao.org/home/index.html#HOME Accessed July 2013.
Garnett T (2008) Cooking up a storm. Food, greenhouse gas emissions and our changing climate. Food Climate Research Network, Guildford, UK
Garnett T (2011) Where are the best opportunities for reducing greenhouse gas emissions in the food system (including the food chain)? Food Policy 36:S23–S32
Godfray C, Beddington J, Crute I, Haddad L, Lawrence D, Muir J et al (2010) Food security: the challenge of feeding 9 billion people. Science 327:812–818
Gonzalez A, Frostell B, Carlsson-Kanyama A (2011) Protein efficiency per unit energy and per unit greenhouse gas emissions: potential contribution of diet choices to climate change mitigation. Food Policy 36:562–570
Health Council of the Netherlands. Guidelines for a healthy diet: the ecological perspective. Health Council of the Netherlands: The Hague, The Netherlands, 2011.
Henderson L, Gregory J, Swan G (2002) The national diet and nutrition survey. Adults aged 19 to 64. Volume 1: types and quantities of foods consumed. HMSO, London
Huang T, Yang B, Zheng J, Li G, Wahlqvist ML, Li D (2012) Cardiovascular disease mortality and cancer incidence in vegetarians: a meta-analysis and systematic review. Ann Nutr Metab 60:233–240
Intergovernmental Panel on Climate Change (2007) IPCC fourth assessment report: climate change 2007. IPCC, Geneva, Switzerland
Key TJ, Fraser GE, Thorogood M, Appleby PN, Beral V, Reeves G, Burr ML, Chang-Claude J, Frentzel-Beyme R, Kuzma JW, Mann J, McPherson K (1999) Mortality in vegetarians and nonvegetarians: detailed findings from a collaborative analysis of 5 prospective studies. Am J Clin Nutr 70(3S):516S–524S
Macdiarmid J (2013) Is a healthy diet and environmentally sustainable diet? Proc Nutr Soc 72(1):13–20
Macdiarmid J, Kyle J, Horgan G, Loe J, Fyfe C, Johnstone A, McNeill G (2012) Sustainable diets for the future: can we contribute to reducing greenhouse gas emissions by eating a healthy diet? Am J Clin Nutr 96:632–639
Masset G, Vieux F, Verger E, Soler L-G, Touazi D, Darmon N. Reducing energy intake and energy density for a sustainable diet: a study based on self-selected diets in French adults. American Journal of Clinical Nutrition, 2014;doi:10.3945/ajcn.113.077958
Millward D, Garnett T (2010) Food and the planet: nutritional dilemmas of greenhouse gas emission reductions through reduced intakes of meat and dairy foods. Proc Nutr Soc 69(1):103–1118
Nijdam D, Rood T, Westhoek H (2012) The price of protein: review of land use and carbon footprints from life cycle assessments of animal food products and their substitutes. Food Policy 37:760–770
Quested T, Ingle R, Parry A (2013) Household food and drink waste in the United Kingdom 2012. WRAP, London
Ray D, Mueller N, West P, Foley J (2013) Yield trends are insufficient to double global crop production by 2050. PLoS One 8(6):e66428
Roe M, Finglas P, Church S (2002) McCance and Widdowson’s the composition of foods, 6th edn. Royal Society of Chemistry, London, UK
Roy P, Nei D, Orikasa T, Xu Q, Okadome H, Nakamura N, Shiina T (2009) A review of life cycle assessment (LCA) on some food products. J Food Eng 90(1):1–10
Saxe H, Larsen TM, Morgensen L (2013) The global warming potential of two healthy Nordic diets compared with the average Danish diet. Clim Chang 116:249–262
Scagliusi F, Ferriolli E, Pfrimer K, Laureano C, Cunha C, Gualano B, Lourenco B, Lancha A (2008) Under-reporting of energy intake is more prevalent in a healthy dietary pattern cluster. Br J Nutr 100(5):1060–1068
Spiciefoodie.com. Homemade soy milk. http://www.spiciefoodie.com/2013/01/14/homemade-soy-milk-or-how-to-make-soy-milk/ Accessed September 2013.
StataCorp (2011) Stata: release 12. College Station, Texas
Stehfest E, Bouwman L, van Vuuren D, den Elzen M, Eickhout B, Kabat P (2009) Climate benefits of changing diet. Clim Chang 95:83–102
Steinfeld H, Gerber P, Wassenaar T, Castel V, Rosales M, de Haan C (2006) Livestock’s long shadow: environmental issues and options. FAO, Rome, Italy
Vieux F, Darmon N, Touazi D, Soler L (2012) Greenhouse gas emissions of self-selected individual diets in France: changing the diet structure or consuming less? Ecol Econ 75:91–101
Vieux F, Soler L-G, Touazi D, Darmon N (2013) High nutritional quality is not associated with low greenhouse gas emissions in self-selected diets of French adults. Am J Clin Nutr 97:569–583
Weidema B, Hermansen J, Kristensen T, Halberg N (2008) Environmental improvement potentials of meat and dairy products. European Commission, Brussels, Belgium
Wilson N, Nghiem N, Ni Mhurchu C, Eyles H, Baker M, Blakely T (2013) Foods and dietary patterns that are healthy, low-cost, and environmentally sustainable: a case study of optimization modelling for New Zealand. PLoS One 8(3):e59648