Carbon Footprint of Your Diet by Food Category: Complete Data Guide

Food production is responsible for 26 percent of global greenhouse gas emissions, according to the landmark 2018 study by Poore and Nemecek published in Science. That figure includes everything from land use change and farming to processing, transport, retail, and packaging. But not all foods contribute equally. Beef generates roughly 60 kg of CO2 equivalent per kilogram of product, while lentils produce less than 1 kg. Understanding these numbers is the first step toward making dietary choices that are better for both your health and the planet.

This guide presents the most comprehensive food carbon footprint data available, drawn from peer-reviewed research and global datasets, organized into clear reference tables you can use for everyday decisions.

What Foods Have the Highest Carbon Footprint?

The carbon footprint of food is measured in kilograms of CO2 equivalent (CO2e) per kilogram of product. CO2e accounts for all greenhouse gases, including methane (CH4) and nitrous oxide (N2O), converted to their carbon dioxide warming equivalent.

The following table covers 50+ common foods, organized by category. All data is sourced from Poore and Nemecek (2018), supplemented by Our World in Data aggregations and IPCC food systems reporting.

Animal Products

Food	CO2e per kg	Primary Emission Source
Beef (beef herd)	60.0	Methane, land use change
Lamb and mutton	24.0	Methane, feed production
Cheese	21.2	Dairy methane, processing
Beef (dairy herd)	21.1	Methane, feed production
Butter	11.5	Dairy methane, processing
Prawns (farmed)	11.8	Land use, feed, energy
Pork	7.2	Feed production, manure
Poultry (chicken)	6.1	Feed production, energy
Eggs	4.7	Feed production, manure
Fish (farmed)	5.1	Feed production, energy
Fish (wild-caught)	3.5	Fuel for fishing vessels
Milk	3.2	Methane, feed production
Yogurt	3.5	Dairy methane, processing

Plant-Based Proteins

Food	CO2e per kg	Primary Emission Source
Dark chocolate	18.7	Land use change, processing
Coffee	16.5	Land use change, transport
Tofu	3.0	Soybean cultivation
Tempeh	2.6	Soybean cultivation
Peanuts	2.5	Cultivation, processing
Chickpeas	0.8	Cultivation
Lentils	0.9	Cultivation
Beans (kidney, black)	0.8	Cultivation
Peas	0.9	Cultivation
Soymilk	1.0	Soybean cultivation

Grains and Staples

Food	CO2e per kg	Primary Emission Source
Rice	4.0	Methane from paddy fields
Wheat	1.4	Fertilizer, cultivation
Oats	1.6	Cultivation, processing
Bread	1.4	Wheat cultivation, baking
Pasta	1.5	Wheat cultivation, processing
Corn (maize)	1.1	Fertilizer, cultivation
Potatoes	0.5	Cultivation
Cassava	1.3	Cultivation, processing

Vegetables

Food	CO2e per kg	Primary Emission Source
Tomatoes (greenhouse)	2.1	Heating energy
Tomatoes (field)	1.4	Cultivation
Broccoli	0.9	Cultivation
Cabbage	0.4	Cultivation
Carrots	0.4	Cultivation
Onions	0.5	Cultivation
Spinach	0.5	Cultivation
Lettuce	0.7	Cultivation
Bell peppers	1.0	Cultivation
Mushrooms	0.8	Substrate, energy
Asparagus (air-freighted)	5.3	Air transport

Fruits

Food	CO2e per kg	Primary Emission Source
Bananas	0.7	Cultivation, shipping
Apples	0.4	Cultivation
Oranges	0.5	Cultivation
Berries (local, seasonal)	0.7	Cultivation
Berries (air-freighted)	4.0+	Air transport
Grapes	0.8	Cultivation
Avocados	2.5	Land use, irrigation
Mangoes	1.5	Cultivation, transport

Nuts and Seeds

Food	CO2e per kg	Primary Emission Source
Almonds	2.3	Water use, cultivation
Cashews	2.1	Cultivation, processing
Walnuts	1.8	Cultivation
Sunflower seeds	1.5	Cultivation
Chia seeds	1.2	Cultivation

A clear pattern emerges from this data. Animal products, particularly ruminant animals like cattle and sheep, dominate the top of the emissions table. This is primarily driven by enteric fermentation (methane produced during digestion), feed crop production, and land use change associated with grazing and feed cultivation.

Is a Plant-Based Diet Better for the Environment?

Yes. The scientific evidence consistently shows that plant-based diets have a significantly lower carbon footprint than diets centered on animal products. Poore and Nemecek (2018) found that shifting from the average global diet to a plant-based diet could reduce an individual's food-related carbon footprint by up to 73 percent.

The IPCC Special Report on Climate Change and Land (2019) identified dietary shifts toward plant-based foods as one of the most impactful individual actions for reducing greenhouse gas emissions from the food system.

Here is a comparison of estimated daily carbon footprints by diet type, based on data compiled by Our World in Data from multiple life cycle assessment studies:

Diet Type	Avg. Daily CO2e (kg)	Avg. Annual CO2e (tonnes)
High meat (100g+ daily)	7.2	2.6
Medium meat (50-99g daily)	5.6	2.0
Low meat (under 50g daily)	4.7	1.7
Pescatarian	3.9	1.4
Vegetarian	3.8	1.4
Vegan	2.9	1.1

The difference between a high-meat diet and a vegan diet is approximately 1.5 tonnes of CO2e per year. To put that in perspective, that is roughly equivalent to the emissions from a one-way transatlantic flight from London to New York.

However, it is worth noting that not all plant foods are equal. Air-freighted berries, greenhouse-grown tomatoes in winter, and foods with high land-use-change impacts like some palm oil or soy products can carry significant footprints. A locally-focused, seasonal plant-based diet achieves the greatest reductions.

How Much CO2 Does Beef Produce Per Kg?

Beef from dedicated beef herds produces approximately 60 kg of CO2e per kilogram of edible product, making it the highest-emission common food by a wide margin. Beef from dairy herds (where meat is a byproduct of milk production) produces roughly 21 kg of CO2e per kilogram, which is still significantly higher than most other foods.

The breakdown of beef emissions, as detailed by Poore and Nemecek (2018), includes:

Emission Source	Share of Total Beef Emissions
Enteric fermentation (methane)	40-45%
Feed production	20-25%
Land use change	15-20%
Manure management	5-10%
Processing and transport	5-8%

The variation in beef emissions is enormous. Brazilian beef raised on deforested Amazon land can exceed 100 kg CO2e per kilogram due to the carbon released from forest clearing. Meanwhile, some well-managed European grass-fed operations may produce 15-25 kg CO2e per kilogram.

Key fact: producing 1 kg of beef requires approximately 25 kg of feed grain and 15,000 liters of water over the animal's lifetime, according to research published in the journal Water Resources and Industry by Mekonnen and Hoekstra (2012). This feed conversion inefficiency is a major driver of beef's environmental impact.

What Is the Most Sustainable Protein Source?

When comparing protein sources by carbon footprint per gram of protein (rather than per kilogram of food), legumes and pulses clearly lead the ranking. This metric matters because the purpose of eating protein-rich foods is to get protein, and different foods deliver different amounts per kilogram.

Protein Source	Protein per 100g	CO2e per kg	CO2e per 100g Protein
Lentils	25g	0.9	3.6
Chickpeas	19g	0.8	4.2
Black beans	21g	0.8	3.8
Peas	5g	0.9	18.0
Tofu	17g	3.0	17.6
Peanuts	26g	2.5	9.6
Eggs	13g	4.7	36.2
Chicken breast	31g	6.1	19.7
Salmon (farmed)	20g	5.1	25.5
Pork loin	26g	7.2	27.7
Cheese (cheddar)	25g	21.2	84.8
Beef steak	26g	60.0	230.8
Lamb chop	25g	24.0	96.0

Lentils produce just 3.6 kg of CO2e per 100 grams of protein. Beef steak produces 230.8 kg of CO2e for the same amount of protein. That means beef protein is roughly 64 times more carbon-intensive than lentil protein.

For those who include animal products in their diet, eggs and chicken are the most carbon-efficient animal protein sources. Switching from beef to chicken for the same protein intake reduces emissions by roughly 90 percent.

Can You Eat High Protein and Be Sustainable?

Absolutely. The idea that high-protein diets must be environmentally destructive is a misconception. Athletes and bodybuilders can reach protein targets of 1.6-2.2 grams per kilogram of bodyweight while maintaining a low carbon footprint.

Consider a 75 kg individual aiming for 150 grams of protein per day. Here is a comparison of two approaches:

High-carbon protein day (beef-heavy):

Food	Amount	Protein	CO2e
Beef steak	300g	78g	18.0 kg
Cheese	100g	25g	2.1 kg
Eggs (3)	150g	20g	0.7 kg
Milk	500ml	17g	1.6 kg
Chicken breast	100g	31g	0.6 kg
Total		171g	23.0 kg

Low-carbon protein day (diversified):

Food	Amount	Protein	CO2e
Lentils (cooked)	300g	27g	0.3 kg
Chicken breast	200g	62g	1.2 kg
Tofu	200g	34g	0.6 kg
Eggs (2)	100g	13g	0.5 kg
Chickpeas	150g	14g	0.1 kg
Greek yogurt	200g	20g	0.7 kg
Total		170g	3.4 kg

Both days deliver roughly 170 grams of protein. The diversified approach produces 85 percent less CO2e. The key strategies are replacing some beef with poultry, incorporating legume-based proteins, and using a mix of animal and plant sources.

Research by Dr. Marco Springmann at the Oxford Martin Programme on the Future of Food has shown that "flexitarian" diets that reduce but do not eliminate animal products can achieve 50-70 percent of the emissions reductions of fully vegan diets while being more accessible and sustainable long-term for most people.

Beyond Carbon: Other Environmental Impacts of Food

Carbon footprint is important but not the only environmental metric that matters. A complete life cycle assessment (LCA) of food production also considers:

Environmental Metric	What It Measures	Highest-Impact Foods
Land use	Hectares per kg of food	Beef, lamb, cheese
Water use (blue water)	Liters per kg of food	Almonds, rice, beef
Eutrophication	Nutrient pollution to waterways	Farmed fish, pork, poultry
Acidification	Acid rain precursor emissions	Beef, pork, poultry
Biodiversity loss	Species affected per unit	Beef, palm oil, soy (deforestation)

Poore and Nemecek (2018) found that the lowest-impact animal products still exceed the highest-impact plant products across nearly all environmental metrics. This finding held true across 38,700 commercially viable farms in 119 countries.

The IPCC's Sixth Assessment Report (2022) further confirmed that dietary shifts toward plant-based foods represent one of the demand-side mitigation strategies with the highest potential for reducing food system emissions by 2050.

How Nutrola Could Help Track Your Diet's Environmental Impact

Understanding the carbon footprint of individual foods is valuable, but the real challenge is tracking these impacts across an entire diet over weeks and months. This is where detailed nutrition tracking becomes a powerful sustainability tool.

Nutrola, starting at just 2.50 euros per month with zero ads, already tracks over 100 nutrients across a verified database of more than 1.8 million foods. Its AI-powered photo recognition, voice logging, and barcode scanning make it fast to log every meal accurately.

Because Nutrola records exactly what you eat, including quantities and food types, it creates the data foundation needed to estimate dietary carbon footprints. Users who track consistently can review their food logs to identify their highest-emission habits and find lower-carbon alternatives that still meet their protein, calorie, and micronutrient targets.

The combination of detailed nutritional data and environmental awareness is where real progress happens. You do not have to choose between eating well and eating sustainably. With the right data, you can do both.

Key Takeaways

• Beef and lamb have the highest carbon footprints, at 60 and 24 kg CO2e per kilogram respectively
• Lentils, beans, and chickpeas are the most sustainable protein sources, producing 64 times less CO2e per gram of protein than beef
• A vegan diet produces roughly 1.5 fewer tonnes of CO2e per year compared to a high-meat diet
• You can eat 150+ grams of protein daily with 85 percent lower emissions by diversifying protein sources
• Detailed food tracking with tools like Nutrola creates the data foundation for making both nutritionally and environmentally informed dietary choices
• The single highest-impact dietary change for the environment is reducing beef consumption, even partially

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Sources: Poore, J. and Nemecek, T. (2018). Reducing food's environmental impacts through producers and consumers. Science, 360(6392), 987-992. Our World in Data (2023). Environmental Impacts of Food Production. IPCC (2019). Special Report on Climate Change and Land. IPCC (2022). Sixth Assessment Report, Working Group III. Mekonnen, M.M. and Hoekstra, A.Y. (2012). A global assessment of the water footprint of farm animal products. Water Resources and Industry. Springmann, M. et al. (2018). Options for keeping the food system within environmental limits. Nature, 562, 519-525.