This piece is part of my “Arguments” series. In this collection of posts, I examine and respond to some of the most common arguments used to defend the exploitation of animals or to criticise veganism.
These articles are not intended to be exhaustive treatments of each topic. Rather, they are designed as practical reference pieces, helping readers reflect on these arguments more carefully and respond to them in a thoughtful, informed way.
You can find other entries in this series here.
The Claim
This argument is often raised in response to veganism in two related forms:
- That plants are alive, so eating them is morally equivalent to eating animals.
- That plants can feel pain, so veganism does not meaningfully reduce harm.
Both arguments quickly fall apart under any serious moral scrutiny.
The Short Answer
Plants are of course alive, but there is no credible scientific evidence that they are sentient or capable of feeling pain. They lack nervous systems, brains, and the structures required for conscious experience.
Animals, by contrast, are clearly sentient and capable of suffering.
Even if we assumed, hypothetically, that plants might be sentient, eating animals would still cause more harm overall, because far more plants are required to feed farmed animals than to feed humans directly.
Veganism does not claim to eliminate all harm. It aims to reduce avoidable harm where possible. Given current evidence, eating plants directly causes less harm than eating animals, making a plant-based diet the most ethically consistent option.
The Detail
What This Argument Assumes
This argument suggests that because plants are living organisms, harming them is morally comparable to harming animals. It is usually presented as a way of undermining vegan ethics, rather than as a way of advocating for the interests of plants: If plants are “alive too,” then avoiding animal products is portrayed as inconsistent or hypocritical.
This is a textbook example of a logical fallacy known as tu quoque, which attempts to discredit a position by alleging inconsistency rather than addressing its core reasoning (1).
Rather than engaging with why vegans oppose animal exploitation, the argument tries to shift attention away from that question, by instead focusing on something that vegans are “guilty of”.
Alive vs. Sentient
Vegans do not avoid animal products simply because animals are alive – we avoid them because animals are sentient. Sentience refers to the capacity to have subjective experiences, such as pain, pleasure, fear, and comfort. It requires structures capable of processing conscious experience, including nervous systems and brains (2).
Plants are complex, living organisms that respond to their environments. They can grow toward light, release chemical signals, and react to damage. However, these responses do not indicate conscious experience. Current research suggests that plants lack:
- Nervous systems
- Brains
- Pain receptors
- Centralised information processing structures
These are considered necessary for sentience and subjective experience (3, 4).
Mainstream plant biology does not support the claim that plants feel pain in any meaningful sense. Claims about “plant consciousness” or “plant pain” are generally based on misinterpretations or popular pseudoscience rather than established research (5). By contrast, there is strong evidence that many animals, including those commonly farmed for food, are sentient (6).
Scientific Consensus on Animal Sentience
In recent decades, research in neuroscience, ethology, and cognitive science has increasingly documented animal sentience. This includes evidence for:
- Pain perception
- Emotional responses
- Learning and memory
- Social awareness
- Stress and fear responses
In 2012, a group of leading neuroscientists issued the Cambridge Declaration on Consciousness, affirming that many non-human animals possess the neurological substrates necessary for conscious experience (7). Subsequent reviews and policy reports have reinforced this conclusion (8). There is no even remotely comparable body of evidence supporting plant sentience.
Even If Plants Were Sentient
Some people argue that even if evidence is lacking, we should “play it safe” and assume plants might be sentient. Even if we accepted this hypothetical position, it would not justify eating animals.
This is because producing animal products requires far more plant consumption than eating plants directly. Farmed animals consume large quantities of crops throughout their lives, and only a small fraction of that energy is converted into meat, milk, or eggs (9).
As a result, animal-based diets require significantly more plant cultivation than plant-based diets. If someone were genuinely concerned about minimising plant suffering, the most consistent response would be to eat plants directly rather than feed them to animals first.
In that case, veganism would still be the least harmful option, for both plants and non-human animals. Furthermore, even if the premise were true, this would have absolutely no relevance for a discussion about animal sentience. If both animals and plants are sentient, and that is a concern we should take seriously, why are most people choosing to consume both?
Environmental Impacts and Indirect Harm
This argument also overlooks the wider environmental damage associated with animal agriculture. Large-scale livestock production is a major driver of:
- Deforestation
- Habitat destruction
- Biodiversity loss
- Water pollution
- Climate change
Much of this damage is caused by clearing land to grow animal feed crops (10).
If plant harm were a serious concern, these impacts would matter greatly, since they involve the destruction of vast numbers of plants and ecosystems. Plant-based diets consistently use less land, water, and crops than animal-based diets (11).
Moral Relevance and Practical Ethics
Veganism does not claim to eliminate all harm.
Any form of agriculture affects ecosystems. Growing crops involves land use, machinery, and environmental disruption. No human diet is completely harm-free, at least not in consumer societies.
The ethical question is therefore not whether harm exists at all, but whether it can be reduced. The choice is between:
- Food derived from clearly sentient beings, and
- Food derived from organisms with no evidence of sentience,
The morally cautious option is clear. Veganism is simply an attempt to minimise avoidable harm where reasonable alternatives exist.
Summary
Plants are living organisms, but current scientific evidence does not support the claim that they are sentient or capable of feeling pain. By contrast, strong evidence supports animal sentience.
Even if plants were hypothetically sentient, eating animals would still cause more overall plant harm due to feed inefficiency, land use and deforestation.
Animal agriculture also causes extensive indirect environmental damage. A plant-based diet remains the most consistent way to reduce harm within the limits of human survival.
Bibliography
- Walton, Douglas. Informal Logic: A Pragmatic Approach. Cambridge University Press, 2008.
- Allen, Colin, and Marc Bekoff. “Animal Consciousness.” Scientific American, 2007.
- https://www.scientificamerican.com/article/animal-consciousness/
- Taiz, Lincoln, et al. “Plants Neither Possess nor Require Consciousness.” Trends in Plant Science, 2019.
- https://www.cell.com/trends/plant-science/fulltext/S1360-1385(19)30135-1
- Mallatt, Jon, et al. “Consciousness Is Not a Gradual Phenomenon.” Animal Sentience, 2020.
- https://animalstudiesrepository.org/animsent/vol5/iss32/1/
- Robinson, Michael. “Do Plants Feel Pain?” BBC Future, 2014.
- https://www.bbc.com/future/article/20140609-do-plants-feel-pain
- Birch, Jonathan, et al. “Review of the Evidence of Sentience in Cephalopod Molluscs and Decapod Crustaceans.” London School of Economics, 2021.
- https://www.lse.ac.uk/philosophy/blog/2021/11/19/sentience-review/
- Low, Philip, et al. “The Cambridge Declaration on Consciousness.” 2012.
- http://fcmconference.org/img/CambridgeDeclarationOnConsciousness.pdf
- European Food Safety Authority. “Scientific Opinion on Animal Welfare.” 2023.
- https://www.efsa.europa.eu/en/topics/topic/animal-welfare
- Poore, Joseph, and Thomas Nemecek. “Reducing Food’s Environmental Impacts.” Science, 2018.
- https://www.science.org/doi/10.1126/science.aaq0216
- FAO. Livestock’s Long Shadow. United Nations, 2006.
- https://www.fao.org/3/a0701e/a0701e00.htm
- Our World in Data. “Environmental Impacts of Food Production.”
- https://ourworldindata.org/environmental-impacts-of-food
Support independent, research-based advocacy
Helping keep free, educational content online
