Vegan Diet Cuts Food Emissions Nearly in Half
A study in Frontiers in Nutrition compared four meal plans with the same calorie count and measured emissions, land use and water use.
Updated on Nov. 13, 2026 in Vegetarian
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A study published in Frontiers in Nutrition found that a vegan diet produced 46 percent less CO2 than a Mediterranean diet providing the same daily calories. The vegan plan also used 33 percent less land and 7 percent less water.
Why it matters
Food production is a major source of greenhouse gas emissions, and the findings show how dietary choices can shift environmental impact while still meeting most nutritional needs. The research, led by Noelia Rodriguez-Martín, PhD, at the University of Granada, adds to growing evidence on the environmental footprint of eating patterns.
The study modeled four plans at about 2,000 calories per day, with vegan meals emitting 2.1 kilograms of carbon daily versus 3.8 kilograms for omnivorous meals. Only vitamin D, iodine and vitamin B12 needed extra attention on the vegan menu, and the modeled results do not reflect everyday eating behavior.
The players
Noelia Rodriguez-Martín, PhD
Researcher at the University of Granada who led the study comparing the environmental impact and nutritional adequacy of four meal plans.
University of Granada
Public university in Granada, Spain, where the study was led and where its researchers are based.
The details
Researchers compared a Mediterranean diet with meat, a pescatarian diet, a vegetarian diet with eggs and dairy, and a vegan diet, each providing about 2,000 calories per day. The vegan menu met nearly all recommended daily nutritional requirements, with only vitamin D, iodine and vitamin B12 needing extra attention.
Timeline
Germany's vegan population roughly doubled between 2016 and 2020, reaching 2 percent.
The UK vegan population jumped 2.4 times between 2023 and 2025, to nearly 5 percent.
The study's findings were reported in an article published on 2026-11-13.
Health Landscape
The findings add to peer-reviewed comparisons of dietary environmental footprints published in Frontiers in Nutrition. Rising vegan adoption in Germany and the UK suggests these plant-based choices are becoming a more visible part of mainstream eating.
Shifting from a Mediterranean-style diet to a vegan one could cut the daily carbon footprint of meals substantially according to the modeled results. Anyone considering this change should pay attention to vitamin D, iodine and vitamin B12, which the study flagged as needing extra care.
The takeaway
Dietary swaps can meaningfully lower food-related emissions, but planning for vitamin D, iodine and vitamin B12 remains essential for anyone eating fully plant-based.
Further reading
For more on plant-based eating, explore our Vegetarian coverage.
Source note: This article includes information reported by VegNews Magazine.
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