‘A vegetarian world would be healthier, cooler’

By eating less meat and more fruit and vegetables, the world could avoid several million deaths per year by 2050, cut planet-warming emissions substantially, and save billions of dollars annually in healthcare costs and climate damage, experts said.

A new study, published in the Proceedings of the National Academy of Sciences of the United States of America, is the first to estimate both the health and climate change impacts of a global move toward a more plant-based diet, they said.

Unbalanced diets are responsible for the greatest health burden around the world, and our food system produces more than a quarter of greenhouse gas emissions, said lead author Marco Springm-ann of the Oxford Martin Programme on the Future of Food.

“What we eat greatly influences our personal health and the global environment,” he said. The Oxford University researchers modelled the effects of four different diets by mid-century: a “business as usual” scenario; one that follows global guidelines including minimum amounts of fruits and vegetables and limits on red meat, sugar and total calories; a vegetarian diet; and a vegan diet. Adopting a diet in line with the global guidelines could avoid 5.1 million deaths per year by 2050, while 8.1 million fewer people would die in a world of vegans who do not consume animal products, including eggs and milk. When it comes to climate change, following dietary recommendations would cut food-related emissions by 29 per cent, adopting vegetarian diets would cut them by 63 per cent and vegan diets by 70 per cent.

Dietary shifts could produce savings of $700 billion to $1,000 billion per year on healthcare, unpaid care and lost working days, while the economic benefit of reduced greenhouse gas emissions could be as much as $570 billion, the study said.

The researchers found that three-quarters of all benefits would occur in developing countries, although the per capita impacts of dietary change would be greatest in developed nations, due to higher rates of meat consumption and obesity. The economic value of health improvements could be comparable with, and possibly larger than, the value of the avoided damage from climate change, they added.