Which diet is more climate friendly: novel foods or mostly vegan?: research

As reported recently in Anthropocene Magazine, a new study published in the journal Nature Food finds that “eating insect meal, kelp, lab-grown eggs, and other novel foods greatly reduces climate impact. But there’s also a simpler solution: eating less meat.”


“So-called ‘novel foods’ such as insect powder and algae are increasingly being touted for their environmental and health benefits. Now a new study finds that if widely adopted, these ‘future foods’ could indeed dramatically cut the global warming potential of European diets, while fulfilling key nutritional needs. 

But, the new analysis also suggests that such diets may just be a more complicated and risky route to achieving climate targets we already know we can largely reach with just one key dietary change: reducing the amount of meat we consume.

The researchers, writing in Nature Food, explain how they created a model combining varied diet types—including diets rich in animal-sourced foods, vegan foods, plant-based proteins like tofu and meat substitutes, and ‘novel foods’ — to determine the optimal dietary combination for environmental and nutritional benefits. ‘Novel food’ diets include farmed insects, protein made from fungus and microbes, farmed seaweed, nutrient-rich powders made from blue-green algae, and cell-cultured foods such as meat, milk and eggs that would be grown in vats, independently of chickens and cows.

The boon of these new and developing foods is that they can be produced efficiently in limited space, taking strain off the land and water resources, and generating far less in the way of greenhouse gasses. 

When researchers tallied up the water-use, land-use, and emissions impact of optimized diets, the benefits of these novel foods clearly shone through. Incorporating ‘future foods’ in European diets, together with plant-based replacements for animal proteins, could reduce water-use, land-use and the global warming potential of these diets by more than 80%. 

Specifically including insect meal, cultured milk, and microbial protein provided the best balance of trade-offs between nutritional content and environmental impact, the researchers found. And, the contributing benefits of novel foods was significant: most of the water-use and land use impacts of the optimized diets came from the plant-based alternatives that featured in it, not from the novel foods. 

In fact, when novel food diets were parceled out and their impact independently modeled, their benefits came out consistently higher than other dietary options in the model—reducing global warming potential by 83%, water-use by 85%, and land-use by 87% compared to current European diets. Depending on what was being measured, novel foods could be between 4 and 34% less impactful than omnivorous and vegan diets (except when it came to global warming potential, where veganism trumped the benefits of novel foods.)

Novel foods are also more nutrient-dense, and therefore may be efficient than other plant based options at providing key nutrition. They could also prove more climate-resilient, shielded as many are from the elements out on the field.

But while these numbers are impressive, they’re actually not that far off the benefits that could be achieved by simply reducing the share of meat and dairy in European diets—a task that would  currently be much easier to accomplish than getting people to adopt totally new foods. The researchers calculated that limiting meat consumption alone could reduce the impact of European eating habits by 60%. 

Novel foods may bring greater benefits for the environment, but these must be weighed up against the realities of adoption. To the average person, milk cultured in vats, and flours made from ground insects, are not currently palatable options for saving the planet—whereas plant-based alternatives like mushroom burgers and soy proteins, which are becoming increasingly familiar to consumers, might hold more appeal and therefore greater potential to move current diets in the right direction. That’s not to mention the regulatory and policy hurdles that still lie ahead in getting many novel foods to market.

Yet, these foods evidently hold great potential benefits for the climate and planet that we should not overlook, the researchers says—calling for more investments to increase their share in our diets. In the meantime, a lot can be achieved by including more plants and more variety, and crucially, moderating the consumption of animal-based foods.” 

To read the full Anthropocene Magazine article, go to:

Citation:

Mazac, R., Meinilä, J., Korkalo, L. et al. Incorporation of novel foods in European diets can reduce global warming potential, water use and land use by over 80%. Nat Food 3, 286–293 (2022). https://doi.org/10.1038/s43016-022-00489-9

Published by greengrass50

My name is Christine McCullum-Gomez, PhD, RDN. I am a registered dietitian nutritionist with expertise in environmental nutrition, food and nutrition policy, food and nutrition security, food justice, chronic disease prevention, regenerative & organic agriculture, and sustainable healthy dietary patterns. Currently, I serve on the Editorial Review Board and as a Column Editor for the Journal of Hunger & Environmental Nutrition. I live in Bogota, Colombia with my husband, two teenagers (boy-girl twins), and our dog Honey. My website is: www.sustainablerdn.com. You can follow me on Instagram at: https://www.instagram.com/cmccullumgomez/

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