This article is part of my FAQs series.
For well over a decade, I have been answering anonymously submitted questions on my Tumblr blog. Over that time, I have noticed many recurring themes, concerns, and misunderstandings.
This series brings together concise, practical responses to the questions I am asked most often, based on real conversations with people at every stage of thinking about veganism.
If you’d like to see more entries in this series, you can find them here.
The Short Answer
Soy production can cause serious environmental harm – particularly when linked to deforestation and monocropping.
However, most soy grown globally is used to feed farmed animals, not vegans. Eating meat actually drives far more soy-related destruction than eating tofu. While soy is not impact-free, the claim that vegans are responsible for soy deforestation is misleading.
If you have concerns about soy, you can be vegan without eating it. But using soy as a justification for consuming animal products does not stand up to scrutiny.
The Detail
The Environmental Impact of Soy
It is important to begin honestly: Soy production can be very destructive. Large-scale soy farming contributes to:
- Deforestation in the Amazon and Cerrado
- Habitat loss for wildlife
- Soil degradation
- Heavy pesticide use
- Labour exploitation in some regions
These are legitimate concerns and should not be dismissed. Like many monocrops, soy production can have severe ecological consequences when demand is high and regulation is weak.
Who Is Driving That Demand?
This is where the common anti-vegan argument falls apart. Approximately 75 to 80 percent of global soy production is used as animal feed, primarily for chickens, pigs, dairy cows, and farmed fish.
Only a small percentage is used directly for human consumption, such as tofu, tempeh, soy milk, and edamame. That means eating chicken, pork, dairy, or eggs consumes large quantities of soy indirectly. Eating tofu, for example, consumes soy directly – but far less overall.
Producing animal protein usualy involved growing soy to feed animals, who then convert it inefficiently into meat. This requires far more land, water, and crops than consuming plant protein directly.
This means that if someone is concerned about soy-driven deforestation, reducing or eliminating animal products is one of the most effective steps they can take.
You Don’t Need Soy to Be Vegan
Another overlooked point is that soy is not essential to a vegan diet. Soy is popular because it is very affordable, cheap and high in protein. Even that being the case, it is not nutritionally necessary for a plant-based diet.
You can meet protein needs from:
- Lentils
- Chickpeas
- Beans
- Peas
- Nuts and seeds
- Whole grains
If someone has ethical objections to soy specifically, they can be both vegan and soy-free without difficulty. You can find more suggestions for plant-based proteins here.
The Fallacy Behind the Argument
The soy objection usually takes this form:
“Soy causes environmental harm. Vegans eat soy. Therefore vegans are hypocrites.”
Even if soy were as destructive as meat (it is not), this would still be a tu quoque fallacy – attacking alleged hypocrisy rather than addressing whether exploiting animals is justified.
Pointing to harm in plant agriculture does not justify greater harm in animal agriculture. All large-scale food systems have impacts, the relevant ethical question is comparative:
“Which system causes less harm overall?”
On nearly every environmental metric, including land use, greenhouse gas emissions, and water use – plant-based diets perform significantly better than meat-heavy diets.
The Bigger Picture
Monocropping, deforestation, and exploitative labour practices are systemic agricultural problems, not vegan-specific problems.
Soy is destructive when used to support an enormous global appetite for animal products. Reducing that demand reduces pressure on ecosystems. Those genuinely concerned about soy should focus on reducing their own animal product consumption, supporting deforestation-free supply chains, and pressuring corporations and governments for systemic reform.
Using soy as a rhetorical weapon against vegans does nothing to solve these underlying problems.
Suggested Reading
- FAO – “Livestock’s Long Shadow”
https://www.fao.org/3/a0701e/a0701e.pdf - Our World in Data – “Soy” (global usage and land data)
https://ourworldindata.org/soy - WWF – “The Impact of Soy”
https://www.worldwildlife.org/industries/soy - Poore & Nemecek (2018), Science – “Reducing food’s environmental impacts through producers and consumers.”
https://www.science.org/doi/10.1126/science.aaq0216 - IPCC – Climate Change and Land Report
https://www.ipcc.ch/srccl/
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