Knowledge for better food systems

Healthy and climate-friendly diets in New Zealand

This paper by FCRN member Jono Drew investigates whether healthy and climate-friendly diets might vary from global recommendations in the context of New Zealand (using food carbon footprints specific to New Zealand, where possible). It finds that shifting diets towards whole plant foods (such as vegetables, fruits, legumes, and whole grains) and away from red and processed meat would have large health and climate benefits, consistent with recent global recommendations.

Abstract

Background: The global food system is driving both the climate crisis and the growing burden of noncommunicable disease. International research has highlighted the climate and health co-benefit opportunity inherent in widespread uptake of plant-based diets. Nevertheless, uncertainty remains as to what constitutes healthy and climate-friendly eating patterns in specific world regions.

Objectives: Using New Zealand as a case study, this research investigates the extent to which potential contextual differences may affect the local applicability of international trends. It further examines the potential for demand-end avenues to support a transition toward a healthier, more climate-friendly food system in New Zealand.

Methods: A New Zealand-specific life-cycle assessment (LCA) database was developed by modifying cradle to point-of-sale reference emissions estimates according to the New Zealand context. This food emissions database, together with a New Zealand-specific multistate life-table model, was then used to estimate climate, health, and health system cost impacts associated with shifting current consumption to align with dietary scenarios that conform to the New Zealand dietary guidelines (NZDGs).

Results: Whole plant foods, including vegetables, fruits, legumes, and whole grains were substantially less climate-polluting (1.2–1.8 kgCO2ekg) than animal-based foods, particularly red and processed meats (12–21 kgCO2e/kg). Shifting population-level consumption to align with the NZDGs would confer diet-related emissions savings of 4–42%, depending on the degree of dietary change and food waste minimisation pursued. NZDG-abiding dietary scenarios, when modeled out over the lifetime of the current New Zealand population, would also confer large health gains (1.0–1.5 million quality-adjusted life-years) and health care system cost savings (NZ$14–20 billion).

Discussion: Guideline-abiding dietary scenarios, particularly those that prioritise plant-based foods, have the potential to confer substantial climate and health gains. This research shows that major contextual differences specific to New Zealand’s food system do not appear to cause notable deviation from global trends, reinforcing recent international research.

 

Reference

Drew, J., Cleghorn, C., Macmillan, A. and Mizdrak, A. (2020). Healthy and Climate-Friendly Eating Patterns in the New Zealand Context. Environmental Health Perspectives, 128(1).

Read the full paper here. See also the Foodsource chapter What is a healthy sustainable eating pattern?

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Australasia

This region of Oceania comprises Australia, New Zealand, the island of New Guinea, and neighbouring islands in the Pacific Ocean. Its ecozone forms a distinct region with a common geologic and evolutionary history which has resulted in a set of unique types of animals and plants. Due to the reverse seasonality with the US and Europe, much food produce is exported to these countries in the winter from Australia and New Zealand. Except for the lush rainforest of Queensland and the east, much of the Australia is arid and unsuitable for arable agriculture. The country is considered highly vulnerable to climate change and associated impacts including droughts and wildfires.

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