Changes in Japan's food consumption footprints under human depopulation
Year: 2026
Type: article
Abstract: Population growth debates often posit that depopulation would reduce ecological strains. We explore that premise through the case of Japan, where population decline coincides with rising affluence, dietary change, and growing dependence on food imports. Using environmentally-extended multi-regional input-output analysis, we examine changes in Japan’s food-system footprints between 2008-2022 and apply decomposition analysis to identify key drivers. Our findings show that despite a shrinking population, absolute footprints remained stable, while per-capita shares increased by 21-30%, driven primarily by consumption of ultra-processed and animal-based foods, underpinned by affluence and dietary change. Most critically, Japan’s ultra-globalized food system offshores around 90% of its virtual land and water demand, while 54% of embodied GHG emissions are sourced domestically. Hence, Japan’s experience foreshadows a broader structural shift, whereby affluent societies generate disproportionately large per-capita environmental footprints. We emphasize the primacy of consumption and trade in shaping sustainability outcomes in the Anthropocene. • Depopulation in Japan has not reduced food consumption footprints • Rising affluence and caloric intake offset anticipated gains from depopulation • Ultra-processed and animal food products drive most land, water, and GHG footprints • Japan’s consumption footprints are increasingly displaced via international trade • Human depopulation alone is insufficient for sustainable food system transitions
Authors: Anass Barrahmoune, Peter Matanle
Institutions: Okayama University, University of Sheffield
Language: English
Subfield: Ecology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,630
Funder: University of Sheffield
OpenAlex ID: W7135208410