An assessment of the water use associated with Australian diets using a planetary boundary framework
BG Ridoutt, D Baird, K Anastasiou… - Public Health …, 2021 - cambridge.org
BG Ridoutt, D Baird, K Anastasiou, GA Hendrie
Public Health Nutrition, 2021•cambridge.orgObjective: Agriculture accounts for around 70% of global freshwater withdrawals. As such,
the food system has been identified as a critical intervention point to address water scarcity.
Various studies have identified dietary patterns that contribute less to water scarcity.
However, it is unclear what level of reduction is necessary to be considered sustainable. The
pursuit of unnecessarily aggressive reductions could limit dietary diversity. Our objective
was to assess the sustainability of water use supporting Australian dietary habits and the …
the food system has been identified as a critical intervention point to address water scarcity.
Various studies have identified dietary patterns that contribute less to water scarcity.
However, it is unclear what level of reduction is necessary to be considered sustainable. The
pursuit of unnecessarily aggressive reductions could limit dietary diversity. Our objective
was to assess the sustainability of water use supporting Australian dietary habits and the …
Objective
Agriculture accounts for around 70 % of global freshwater withdrawals. As such, the food system has been identified as a critical intervention point to address water scarcity. Various studies have identified dietary patterns that contribute less to water scarcity. However, it is unclear what level of reduction is necessary to be considered sustainable. The pursuit of unnecessarily aggressive reductions could limit dietary diversity. Our objective was to assess the sustainability of water use supporting Australian dietary habits and the adequacy of current dietary guidelines.
Design
Dietary intake data were obtained from the National Nutrition and Physical Activity component of the Australian Health Survey. For each individual daily diet, the water scarcity footprint was quantified, following ISO14046:2014, as well as a diet quality score. Water scarcity footprint results were compared with the planetary boundary for freshwater use downscaled to the level of an individual diet.
Setting
Australia.
Participants
9341 adults participating in the Australian Health Survey.
Results
Dietary water scarcity footprints averaged 432·6 L-eq (95 % CI 432·5, 432·8), less than the 695 litres/person per d available to support the current global population of 7·8 billion, and the 603 litres/person per d available for a future population of 9 billion. Diets based on the Australian Dietary Guidelines required 521 L-eq/d, or 379 L-eq/d with lower water scarcity footprint food choices.
Conclusions
Diets based on the Australian Dietary Guidelines were found to be within the freshwater planetary boundary. What is needed in Australia is greater compliance with dietary guidelines.
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