Credit: CC0 Public Domain
Considering the spectrum of traditional to urban lifestyles across Japan, researchers at the University of Sheffield and the Research Institute for Humanity and Nature in Kyoto, Japan, analysed the carbon footprints of the diets of 60,000 households across Japan's 47 regions. Using a life-cycle approach which details food supply chains around the country, they found that meat consumption was relatively constant per household—but carbon footprints were not.
The study shows that meat consumption could explain less than 10 per cent of the difference seen in carbon footprints between Japanese families. Instead, households with higher carbon footprints tended to consume more food from restaurants, as well as more vegetables and fish. However, it was the level of consumption of sweets and alcohol—two to three times higher than families with low carbon footprints—that really stood out.
Meat has earned a reputation as an environmentally damaging food, with beef production emitting 20 times more greenhouse gases than bean production for the same amount of protein.
However, the researchers caution against a one-size-fits-all policy after finding that the consumption of sweets, alcohol and restaurant food adds to families' footprints in a larger capacity than other items. Eating out was found to contribute on average 770 kg of greenhouse gases per year for those households with a higher footprint, whereas meat contributed just 280kg.
Associate Professor Keiichiro Kanemoto of the Research Institute for Humanity and Nature, Kyoto, Japan—who led the research—said: "If we think of a carbon tax, it might be wiser to target sweets and alcohol if we want a progressive system.
"If we are serious about reducing our carbon footprints, then our diets must change. Our findings suggest that high carbon footprints are not only a problem for a small number of meat lovers in Japan. It might be better to target less nutritious foods that are excessively consumed in some populations."
Kanemoto does, however, recommend eating less meat to reduce a household's environmental impact. "Meat is a high carbon footprint food. Replacing red meat consumption with white meat and vegetables will lower a family's carbon footprint," he said.
Japan's population is one of the oldest in the world, a trend that many industrial countries are following. This suggests that successful policies for dietary change and energy efficiency in Japan could act as models for many countries in the coming decades. The Japanese also have a relatively healthy diet, which is frequently attributed to them having the world's longest lifespan by country.
Dr. Christian Reynolds from the Institute of Sustainable Food at the University of Sheffield, one of the study's co-authors, said: "Due to wealth, culture, and farming practices, different regions in a country consume food differently. Japan alone has some prefectures with more than 10 million people and others with fewer than one million. These regional and income differences in food consumption are also found in the UK, Europe, Australia and the US.
"All countries are facing challenges in how to shift diets to be healthier and more sustainable. This evidence from Japan demonstrates that research can help us to identify what to focus on. The same patterns of dietary change in terms of sugar, alcohol and dining out need to be considered in the UK, Australia, the US and Europe."
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