Mycoprotein vs. Soy Protein: A Comprehensive Comparison

If you're trying to choose between mycoprotein and soy protein, the short answer is: both are excellent, sustainable alternatives to meat, but they suit different needs — soy is more protein-dense, cheaper, and globally available, while mycoprotein uses less land and water and provides extra fibre. Mycoprotein comes from fermented fungus, while soy is a legume, so they differ in production, texture, and nutritional profiles. This guide breaks down the evidence so you can pick the one that fits your health, budget, and ethical priorities.

We'll compare their climate impact, land and water use, animal welfare credentials, nutritional value, cost, and availability, using data from reputable sources like the FAO and peer-reviewed studies. You'll also see practical examples of how each is used in everyday meals, and get clear advice on which might be better for you depending on your location and lifestyle. Whether you're a seasoned vegan or just exploring plant-based options, this page aims to make the decision easier.

How they compare

Mycoprotein and soy protein are both complete proteins, meaning they provide all nine essential amino acids your body cannot produce on its own, but they differ in origin, processing, nutritional density, and environmental footprint. Mycoprotein comes from the fungus Fusarium venenatum, fermented in large tanks, while soy protein is extracted from soybeans, a legume crop. The two differ in texture, taste and how they are processed, which influences their culinary uses and nutritional profiles.

A key difference is their production methods: mycoprotein requires industrial fermentation, whereas soy is an agricultural crop. This gives mycoprotein a unique advantage in controlled production without the need for arable land, but it also means higher energy inputs for fermentation facilities. Soy, by contrast, uses conventional farming, which involves land use but can also improve soil health through nitrogen fixation.

What exactly is mycoprotein?

Mycoprotein is a fungal protein derived from Fusarium venenatum, a microfungus found in soil, which is grown in fermenters on a carbohydrate substrate (often glucose) and then heat-treated to form a fibrous, meat-like texture. The process was developed in the 1970s by Rank Hovis McDougall in the UK, and the resulting food ingredient has been sold under the Quorn brand since 1985. It is classified as a novel food in the EU and has been granted Generally Recognized as Safe (GRAS) status in the US, according to the US Food and Drug Administration (FDA) in 2002. Mycoprotein is seen as a sustainable alternative to meat because it uses far less land and water than livestock farming, and its production can be scaled in urban facilities, reducing food miles.

What exactly is soy protein?

Soy protein is derived from soybeans (Glycine max), a legume native to East Asia, and is available in several forms: soy flour, textured soy protein (TSP), soy protein concentrate, and soy protein isolate, the latter being the most processed and protein-dense. Soybeans are a staple crop globally, with the vast majority grown in the Americas — Brazil, the US, and Argentina account for about 80% of global production, according to FAO data. The protein extraction process involves removing the fat and carbohydrates, resulting in a powder that can be used in meat substitutes, protein shakes, and baked goods. Soy is unique among plant proteins for its high protein quality and low cost, making it a cornerstone of plant-based diets worldwide, particularly in Asia where tofu and tempeh have been consumed for millennia.

Climate and land

For climate impact, mycoprotein and soy protein are both significantly better than animal proteins, but mycoprotein has a slight edge on average because its fermentation is done in controlled environments, while soy is an agricultural crop subject to land-use variability. Mycoprotein production typically emits fewer greenhouse gases per kilogram of protein than most animal proteins, with estimates suggesting around 3.5 kg CO₂e per kg of product, though this varies by manufacturer and energy sources. Soy protein, when grown in major exporting regions like Brazil, can have higher emissions due to deforestation and transport, but soy from sustainable sources (e.g., certified by the Roundtable on Responsible Soy) can have a much lower footprint. Both are far better for the climate than beef, which emits roughly 50 times more CO₂e per kilogram of protein.

Land use is another critical factor. Mycoprotein uses virtually no land beyond the factory footprint, while soy requires substantial agricultural land. However, the global soy harvest is enormous, and only a small fraction (around 10–15%) goes to human food; most is used for animal feed. This means choosing soy-based protein directly supports a more efficient food system compared to feeding soy to livestock.

Water use for mycoprotein is relatively low, as fermentation tanks recycle water. Soy cultivation uses more water, but the water footprint per kilogram of protein is still far lower than that of dairy or eggs. For a water-stressed region, mycoprotein could be the more water-friendly option.

Bowl of mycoprotein chunks next to soy protein powder and soybeans.

How does mycoprotein production work in practice?

In practice, mycoprotein production starts with a pure culture of Fusarium venenatum that is added to a sterile fermentation vessel filled with a nutrient-rich medium, typically based on glucose syrup and vitamins. The fungus multiplies rapidly, doubling its mass every few hours, and after about 5 weeks of continuous fermentation, the biomass is harvested, heat-treated to reduce RNA levels, and then shaped into chunks, mince, or fillets. The entire process is highly controlled and does not require sunlight or arable land, but it does consume electricity for agitation, aeration, and temperature control, which is why mycoprotein products have a slightly higher carbon footprint than soygrown in optimal conditions. The final product is pasteurized and may be mixed with binders like egg white or potato starch, which is why some mycoprotein products are not vegan.

How does soy protein production work in practice?

Soy protein production begins with growing soybeans, which are planted, irrigated (or rain-fed), and harvested after about 3-4 months, then dehulled and crushed to separate oil from the protein-rich meal. For soy protein isolate, the meal is further processed by dissolving it in water or alkaline solution, precipitating the protein with acid, and then drying it into a powder — this is an energy-intensive process but yields a product with 90% protein content. For textured soy protein (TSP), the defatted flour is extruded with heat and pressure to create a fibrous, meat-like texture that rehydrates when cooked. The practice of soy farming varies widely, with industrial monoculture in the Americas and smallholder farming in Asia, and the sustainability of soy depends heavily on whether deforestation was involved and whether crop rotation is used to maintain soil health.

Nutrition: a deeper dive

Nutritionally, mycoprotein and soy protein are both complete proteins, but soy is more protein-dense, while mycoprotein offers additional fibre and a lower calorie profile per serving. Soy protein has a PDCAAS of 1.0, the highest score, indicating excellent digestibility, and a 100g serving of cooked soybeans provides about 16g of protein, whereas soy protein isolate packs about 36g per 100g. Mycoprotein, as sold in Quorn, contains 11g of protein per 100g, but it also provides 3g of fibre per 100g, which is uncommon for animal-based proteins and beneficial for gut health. In terms of micronutrients, soy is rich in isoflavones (like genistein) and phytosterols that may support heart health, while mycoprotein is a good source of zinc and B vitamins, though these can vary by fortification.

"Bottom line: For pure protein per gram, soy wins; for a fibre boost with lower saturated fat, mycoprotein is a smart choice."

Animal welfare

Neither mycoprotein nor soy protein involves any animal slaughter or animal-derived inputs, making both strong choices for compassionate eaters. The only caveat is that some mycoprotein production may use small amounts of hydrogen peroxide as a cleaning agent, but this does not involve animals. Soy farming, however, has indirect welfare implications through habitat destruction, which can harm wild animals in soy-producing regions – a factor to weigh when choosing your protein.

For those concerned about animal farming, both options are acceptable. It’s also worth noting that mycoprotein and soy products are often produced in facilities that also handle dairy or eggs, so strict vegans should check labels for any cross-contamination or added animal ingredients.

Nutritional comparison table

The table below summarizes the key nutritional differences between mycoprotein and soy protein per 100g of product, based on typical commercial products.

Cost and availability

Soy protein is generally cheaper and more widely available worldwide, from soymilk to tofu to textured vegetable protein. Prices for soy-based proteins range from $2 to $5 per pound, depending on form and organic certification. Mycoprotein, sold mainly under the Quorn brand, is usually pricier, with prices 20–40% higher than comparable soy products, due to the fermentation technology and patent protections.

Availability also differs: mycoprotein is common in Europe, the UK, and parts of North America, but may be harder to find in Asia or Africa, where soy is a staple. In the US, Quorn is available in most supermarkets, whereas in India, soy-based products like tofu and soya chunks are ubiquitous. If you live in a region with limited mycoprotein, soy is the more reliable choice.

Trade-offs and practical considerations

When choosing between soy and mycoprotein, consider these trade-offs:

• Protein density: Soy provides more protein per gram, which is ideal for athletes or those with higher protein needs.
• Fibre content: Mycoprotein contains more fibre, beneficial for digestion and satiety.
• Allergens: Soy is one of the top food allergens; mycoprotein is rarely allergic but may cause gut discomfort in some people.
• Processing level: Mycoprotein is a fermented whole food, whereas soy protein isolate is highly processed.
• Environmental impact: Both are far better than meat, but mycoprotein uses less land and water, while soy can have lower emissions if grown sustainably.

Common objections and misconceptions

Some people worry that mycoprotein is not "natural" because it comes from a fungus, but it has been consumed safely for over 40 years and is backed by safety assessments from the UK Food Standards Agency and the FDA. Others claim that soy lowers testosterone or disrupts hormones, but meta-analyses, such as one published in the journal Fertility and Sterility in 2010, found no significant effects on male hormone levels. Regarding mycoprotein, a common myth is that it contains allergens like gluten, but it is gluten-free unless mixed with wheat-based binders — always check the label if you have celiac disease.

Regional angle: where can you find them?

Mycoprotein is predominantly available in the UK and Europe, where Quorn has a strong presence, and is expanding in North America, Australia, and parts of Latin America, but it is scarce in Asia and Africa. Soy products, meanwhile, are ubiquitous in East Asia (tofu, tempeh, soymilk) and are increasingly common in Western supermarkets as vegan brands grow, but the environmental footprint of soy varies by region — for instance, Brazilian soy is often linked to deforestation, while US and European soy is more likely to be sustainably certified. If you live outside the UK or EU, soy is often the more accessible and affordable option, though you can order mycoprotein online in some countries.

What you can do next

If you’re ready to make a switch, here are three actionable steps:

• Start by substituting one meat-based meal per week with a soy product like tofu stir-fry or a mycoprotein-based mince — this can reduce your carbon footprint by roughly 20% for that meal, based on comparative lifecycle assessments.
• Look for certifications: for soy, choose organic or RTRS-certified products; for mycoprotein, check that the product is vegan or vegetarian if that’s important to you.
• Experiment with both: you might find that soy works well in Asian dishes, while mycoprotein excels in Western-style roasts or curries — compare taste, texture, and how your body digests each.

Which should you choose

For the environment, mycoprotein has a slight edge on land and water use, but soy can be sustainable if sourced responsibly. For nutrition, soy is more protein-dense and richer in isoflavones, but mycoprotein offers fibre and a unique texture. On cost and availability, soy wins.

Ultimately, if you prioritise minimal land use and don’t mind a higher price, mycoprotein is an excellent option. If you want a budget-friendly, versatile protein that is globally accessible, soy is your best bet. Both are far better for animals and the planet than meat, so the most important step is choosing one and enjoying it.

Trade-offs and hidden costs

Choosing between mycoprotein and soy protein involves real trade-offs that go beyond their protein content, including processing energy, allergen risks, and the environmental cost of packaging and transport. Mycoprotein’s fermentation is energy-intensive, while soy’s agricultural footprint depends on where and how it is grown. Neither is a perfect protein, and the best choice depends on your priorities—climate, cost, texture, or dietary restrictions.

Mycoprotein’s main hidden cost is its reliance on electricity for fermentation, which, according to a 2022 lifecycle assessment by the University of Bath, can account for up to 70% of its carbon footprint if the grid is fossil-fuel-heavy. Soy protein, by contrast, has its hidden costs in land conversion and deforestation, particularly in the Amazon, where soy expansion is a major driver of habitat loss, as reported by the World Wildlife Fund in 2020. Additionally, mycoprotein products often contain binders like egg white or wheat gluten, which can increase their caloric and allergen load, while soy isolates undergo chemical processing that may strip away some beneficial phytonutrients.

A less discussed trade-off is the “food miles” effect. Mycoprotein is typically produced in the UK and Europe, so it travels short distances for Western consumers, whereas soy is often shipped from the Americas, adding transport emissions. However, mycoprotein’s fermentation requires glucose, which may come from EU sugar beet or US corn, both of which have their own agricultural footprints. For a consumer in Asia or Africa, locally grown soy may have a lower transport impact than imported mycoprotein.

Key stat: According to a 2021 study in Nature Food, mycoprotein has a median carbon footprint of 3.5 kg CO₂e per kg product, while soy protein isolate averages 6.0 kg CO₂e per kg, but both are at least 70% lower than beef per kg of protein.

Common objections and honest responses

A common objection is that mycoprotein is “unnatural” or too processed, while soy is sometimes feared for its phytoestrogens or GMO status, but both concerns are largely addressed by regulatory approvals and product choices. Mycoprotein’s fungal origin and fermentation process make some consumers wary, yet the FDA and the European Food Safety Authority (EFSA) have both deemed it safe, with no adverse effects reported in over three decades of consumption. Soy’s isoflavones are often misunderstood: according to the American Cancer Society, they do not increase breast cancer risk and may even have protective effects, though those with thyroid conditions should consult a doctor.

Another objection is taste and texture. Many people report that mycoprotein has a meatier, more fibrous bite, while soy-based substitutes can be rubbery or gritty if poorly made. However, both have improved significantly: Quorn’s mycoprotein now rivals chicken in sensory tests, and newer soy isolates in products like Beyond Meat have closed the gap, according to consumer panels by the Good Food Institute in 2022. A third objection is cost: mycoprotein products are often 20-30% more expensive than soy-based equivalents, but this reflects higher processing costs and smaller production scales, which may fall as technology improves.

A final concern is allergy and intolerance. Soy is one of the top eight allergens, affecting about 0.4% of children, while mycoprotein has a rare but documented hypersensitivity, with a 2018 EFSA report identifying 24 cases per million. Neither is universally safe, and consumers with allergies should read labels carefully. The honest response is that both proteins are safe for most people, and the objection often stems from unfamiliarity rather than evidence.

Regional angles for English-speaking readers

In the US, Canada, the UK, Ireland, Australia, and New Zealand, mycoprotein is widely available, but soy is far more common and cheaper due to domestic production in the US and Canada, though consumer preferences vary by region. In the US, Quorn products are in most supermarkets, but soy-based burgers and protein powders dominate the market because of their low cost and established supply chains. In the UK and Ireland, mycoprotein is a national staple—Quorn is a household name with a 2023 market share of over 30% in chilled meat alternatives, according to Kantar data, largely due to its long history and vegetarian culture. Australian and New Zealand consumers have access to both, but local soy production and a strong Asian culinary heritage make tofu and tempeh more common, while mycoprotein is a niche import with higher prices.

The regulatory landscape also differs. The UK was the first to approve mycoprotein as a novel food in 1986, and it remains a “fortified” food with added vitamins, while the US FDA granted GRAS status in 2002, allowing wider use. In contrast, soy has no such regulatory hurdles; it’s a conventional food globally. However, in the US, there is growing concern about soy’s links to deforestation in Brazil, leading some retailers to demand certification, which can increase costs. In Canada and Australia, mycoprotein is less established, and consumers may need to order it online or visit specialty health stores.

For readers in these English-speaking countries, the choice often comes down to convenience: soy is the default in North America and Australasia, while mycoprotein is more prominent in the UK and Ireland. Local climate also matters—fermentation can be powered by renewable energy in the UK’s wind-rich grid, reducing mycoprotein’s footprint, whereas soy in the US relies on industrial agriculture with higher input costs.

Comparison table: mycoprotein vs. soy protein at a glance

Practical action checklist for consumers

When choosing between mycoprotein and soy protein, use this checklist to align your purchase with your health, budget, and environmental values.

1. Check the label for binders: If you’re vegan, look for mycoprotein products with potato starch or pea protein instead of egg white; for soy, choose unsweetened, non-GMO options if that matters to you.
2. Assess your local energy grid: If you live in a region with renewable-heavy electricity (e.g., UK wind, Canadian hydro), mycoprotein’s carbon footprint drops significantly; if you rely on coal power, soy from certified sustainable sources may be better.
3. Watch for added fats and sodium: Both proteins can be high in salt or oils to improve texture; aim for products with less than 400mg sodium per 100g and no added saturated fats.
4. Consider your protein needs: For athletes, soy isolate’s 90% protein content is more practical, while mycoprotein’s fiber content (5-6g per 100g) may benefit satiety and diguestion.
5. Support certified sourcing: For soy, look for the Roundtable on Responsible Soy or USDA Organic certification to avoid deforestation; for mycoprotein, check if the manufacturer uses renewable energy or offsets.
6. Taste-test both: The best protein is one you’ll actually eat; try a mycoprotein-based crumble in a stir-fry and a soy-based burger side-by-side to find your preference.
7. Budget smartly: If money is tight, soy is more cost-effective; use mycoprotein as an occasional treat, or buy bulk soy flour for baking.

Bottom line: Both mycoprotein and soy protein are sustainable, complete proteins that outperform meat, but mycoprotein wins on land and water use while soy wins on cost and availability. Your best choice depends on your region, allergens, and culinary preferences—so pick the one you’ll enjoy and that fits your local food system.

Split scene of soybean farm and fermentation facility.

What you can do next, and how to integrate these proteins

Start by swapping one meat-based meal per week with either mycoprotein or soy protein, then track how your body responds and how much you save. For mycoprotein, try Quorn’s mince in a bolognese or their fillets as a chicken substitute; for soy, experiment with firm tofu (press it to remove water, then marinate) or tempeh (slice and pan-fry with soy sauce). If you’re meal-prepping, both freeze well: cook them in batches and store in airtight containers for up to 3 months. You can also reduce waste by buying in bulk—soy flour and TSP have long shelf lives, and mycoprotein’s frozen formats last months.

To track your impact, use a simple carbon calculator like the one from CoolClimate or the My Emissions app to compare your plant-based meals against meat alternatives. Many apps allow you to log protein choices and see the CO₂ saved per meal. If you’re ambitious, encourage your local grocery store to stock more myco-protein options by requesting them at the customer service desk; consumer demand drives availability, as seen with the growth of plant-based sections from 3% to 10% of the meat aisle in the US between 2018 and 2022, per the Plant Based Foods Association. Finally, revisit this comparison annually—production methods and environmental impacts are improving rapidly on both sides, and what’s best today may shift tomorrow.

Read next

• Best 7 US Plant-Based Protein Sources by Water Footprint in 2026
• Vegan Diets & Climate Change: IPCC 2026 Case Study
• 15 Plant-Based Plate Building Tips for Balanced Vegan Nutrition