Global diets link environmental sustainability and human health

Summary

Published in Nature in 2014, this widely cited paper by Tilman and Clark analyses the environmental and health consequences of global dietary trends, projecting that continued adoption of 'Western' diets rich in red meat, sugar, and refined foods will substantially increase both non-communicable disease burden and agricultural environmental impacts by 2050. Using scenario modelling, the authors demonstrate that Mediterranean, pescatarian, and vegetarian dietary patterns could plausibly reduce diet-related greenhouse gas emissions and land use while also lowering chronic disease risk. The paper provides a quantitative framework linking food systems sustainability with public health outcomes at a global scale.

UK applicability

Although the study is global in scope, its findings are directly pertinent to UK food and nutrition policy, particularly efforts to align the National Food Strategy and NHS dietary guidance with net-zero commitments; the modelled dietary patterns broadly correspond to shifts already advocated by UK bodies such as the Committee on Climate Change and the Food Standards Agency.

Key measures

Greenhouse gas emissions (CO₂ equivalents); land use (hectares); water use; incidence rates of type 2 diabetes, cardiovascular disease, and colorectal cancer; diet composition by food group

Outcomes reported

The study examined projected changes in diet composition across world regions and modelled associated impacts on greenhouse gas emissions, land use, water use, and diet-related chronic disease burden. It reported quantitative estimates of how adoption of plant-rich diets could simultaneously reduce environmental pressures and incidence of type 2 diabetes, cardiovascular disease, and certain cancers.

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