Abstract
Nutrition guidelines now consider the environmental impact of food choices as well as maintaining health. In Australia there is insufficient data quantifying the environmental impact of diets, limiting our ability to make evidence-based recommendations. This paper used an environmentally extended input-output model of the economy to estimate greenhouse gas emissions (GHGe) for different food sectors. These data were augmented with food intake estimates from the 1995 Australian National Nutrition Survey. The GHGe of the average Australian diet was 14.5 kg carbon dioxide equivalents (CO2e) per person per day. The recommended dietary patterns in the Australian Dietary Guidelines are nutrient rich and have the lowest GHGe (~25% lower than the average diet). Food groups that made the greatest contribution to diet-related GHGe were red meat (8.0 kg CO2e per person per day) and energy-dense, nutrient poor “non-core” foods (3.9 kg CO2e). Non-core foods accounted for 27% of the diet-related emissions. A reduction in non-core foods and consuming the recommended serves of core foods are strategies which may achieve benefits for population health and the environment. These data will enable comparisons between changes in dietary intake and GHGe over time, and provide a reference point for diets which meet population nutrient requirements and have the lowest GHGe.
Highlights
Promoting good nutrition and addressing the escalating costs of health care associated with obesity and other chronic conditions is a major challenge faced by societies and their governments
The Foundation diet had the lowest emissions—about 25% lower than the average Australian diet (10.9 kg CO2e per person per day)
Non-core foods accounted for 27% of the emissions from the average Australian diet (Table 1)
Summary
Promoting good nutrition and addressing the escalating costs of health care associated with obesity and other chronic conditions is a major challenge faced by societies and their governments. Challenging is addressing the issue of environmental sustainability of our food supply and consequences for food and nutrition security. This concern for a sustainable food supply and the urgency to reduce atmospheric carbon to avoid climate change demands informed behaviour changes to reduce diet-related greenhouse gas emissions (GHGe). The production and consumption of food has a range of environmental consequences [1,2,3,4,5]. Nutrition guidelines are increasingly focusing some attention on the environmental impact of food choices as well as the traditional nutritional metrics that relate to meeting nutrient requirements, promoting health and averting chronic disease [6]. We do not have sufficient data quantifying the environmental impact of dietary patterns on which to base these recommendations
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