Cora Diamond vs. Peter Singer on Animal Ethics

Cora Diamond’s “Eating Meat and Eating People” is one of the most important philosophical criticisms of a familiar style of animal-rights argument. The essay does not simply say that animals do not matter, nor does it duplicate Peter Singer’s case against speciesism. Diamond challenges the structure of the argument itself: she questions whether our moral relations with animals can be understood by first listing morally relevant capacities—such as pain, pleasure, intelligence, or self-awareness—and then deciding which beings qualify for particular treatment.

The original version of this MyArticles page correctly recognized a disagreement between Diamond and Singer but seriously distorted Diamond’s position. It suggested, for example, that she thought people should stop eating animals only if they were also willing to eat dead human beings. Her actual argument is subtler. Diamond uses the contrast between eating animals and eating people to show that moral concepts are embedded in forms of human life, relationships, language, and ways of seeing others—not generated only by a neutral checklist of capacities.

Who Is Cora Diamond?

Cora Diamond is an American philosopher known for work on moral philosophy, Ludwig Wittgenstein, literature, and the moral significance of animals.

Her 1978 essay “Eating Meat and Eating People,” published in Philosophy, became especially influential because it criticized what she saw as fundamental confusions in some arguments for animal rights.

Cambridge University Press summarizes the paper as a response to a particular kind of animal-rights argument and notes that Diamond tries to show that moral relations among humans and between humans and animals cannot be captured adequately by that framework.

Who Is Peter Singer?

Peter Singer is a utilitarian philosopher whose work helped transform modern animal ethics.

Singer’s influential argument focuses heavily on sentience: if a being can suffer or experience pleasure, that suffering should matter morally.

He uses the concept of speciesism to criticize giving less consideration to the interests of beings merely because they belong to another species.

In broad terms, Singer asks people to apply the principle of equal consideration of interests consistently across species boundaries.

What Is Speciesism?

Speciesism is usually defined as unjustified discrimination or unequal consideration based on species membership.

The analogy is intentionally provocative. It asks whether saying “human interests count more simply because they are human” resembles other forms of arbitrary exclusion.

Singer does not claim that all animals and all humans must be treated identically. Different beings have different interests. The argument is that comparable interests—especially an interest in avoiding suffering—should not be discounted merely because of species.

Diamond’s Main Objection

Diamond thinks this approach begins from the wrong picture of morality.

She questions the idea that we first identify neutral properties of beings and then derive the whole moral relationship from those properties.

For Diamond, concepts such as “human being,” “animal,” “companion,” “food,” and “fellow creature” already function inside forms of life. They help shape what actions can mean morally.

This is why the title “Eating Meat and Eating People” matters. The fact that most people regard eating a dead human body very differently from eating an animal cannot be fully explained by saying the human body has different current capacities. A dead body has no present capacity for pain or rational thought, yet human practices of grief, respect, burial, and kinship still matter.

The Problem With a Moral Checklist

Imagine attempting to determine moral status by scoring beings according to:

Intelligence.
Ability to suffer.
Self-awareness.
Language.
Future-directed preferences.

Such criteria can illuminate ethically relevant differences. Diamond’s concern is that they can also make morality look as if it starts from a detached classification exercise.

Human moral life does not normally work that way. People do not refrain from eating their relatives because relatives pass a cognition test. They understand them through relationships and practices.

Diamond Does Not Simply Reject Concern for Animals

Cambridge’s description of the essay makes an important point: after criticizing a certain form of rights argument, Diamond still asks what can be said “on the animals’ side.”

Her disagreement is therefore partly about moral foundation.

She thinks compassion for animals can arise from seeing them as fellow creatures, from forms of attention, from relationships, and from rejecting callousness—not only from demonstrating that they share a specific morally relevant capacity with humans.

Singer’s Strength: Consistency

Singer’s framework has a major philosophical advantage: it exposes inconsistency.

If suffering matters when experienced by humans, why should equally serious suffering become irrelevant simply because the sufferer is a pig, chicken, dog, or laboratory animal?

The approach forces people to justify differences rather than relying automatically on species membership.

Diamond’s Strength: Moral Context

Diamond highlights something Singer’s abstract framework can understate: moral meaning is shaped by relationships and practices.

A pet dog, a wild animal, a farm animal, and a laboratory mouse may have similar capacities in some respects, but human beings encounter them through different social practices.

Diamond’s point is not that every existing practice is morally justified. Practices can be cruel or corrupt. The point is that moral understanding involves learning to see what beings are to us, not merely assigning scores to them.

Eating People as a Philosophical Test

The essay’s title creates a deliberately uncomfortable comparison.

Why do people commonly recoil from cannibalism even in cases where the dead person cannot experience pain?

The answer involves more than biological capacities. Human bodies are connected with personhood, mourning, family, respect, memory, and cultural practices surrounding death.

Diamond uses this kind of example to challenge theories that attempt to explain every moral prohibition using a small set of measurable properties.

Does Diamond Defend Meat Eating?

Her position is not a straightforward defense of all existing meat consumption.

The Oxford Academic abstract of a later republication states that Diamond argues against the call to end all killing of animals for food and all use of animals in scientific research. That places her at odds with stronger abolitionist conclusions.

But opposing a particular universal prohibition is not the same as endorsing cruelty, industrial farming practices, or unlimited experimentation.

Her essay is best understood as rejecting a philosophical route to those conclusions rather than declaring that anything humans do to animals is acceptable.

Does Singer Say Animals Are the Same as Humans?

No.

Equal consideration does not require identical treatment.

A human child, adult human, dog, and fish have different needs and interests. A dog has no meaningful interest in voting; a human voter does. A human may have long-term plans that some animals do not appear to have in the same form.

Singer’s question is whether differences in treatment correspond to relevant differences in interests rather than to species membership alone.

Sentience and Suffering

Sentience is central to Singer because the capacity to experience suffering provides a direct reason for moral concern.

This focus has practical force in debates about:

Factory farming.
Animal transport.
Slaughter.
Laboratory research.
Entertainment.

If a practice causes large amounts of avoidable suffering, a sentience-based framework asks whether the benefits can justify that harm.

Diamond and the Concept of “Fellow Creatures”

Diamond is interested in a way of seeing animals that does not depend entirely on proving their similarity to humans.

Calling an animal a fellow creature can express vulnerability, shared life, mortality, and companionship.

This moral vocabulary does not operate like a scientific category. It reflects an attitude toward another living being.

Why Language Matters

Diamond’s philosophical background makes language important.

Words do not simply label neutral objects. They are embedded in practices.

Consider the difference among:

“animal.”
“pet.”
“pest.”
“livestock.”
“companion.”
“food.”

The biological organism may be described differently depending on the human relationship surrounding it.

Ethical reflection can ask whether those categories reveal morally important relationships or hide morally important similarities.

Where Singer and Diamond Actually Agree

Their theories differ, but they are not opposites on every practical question.

Both can criticize cruelty.

Both take human treatment of animals seriously.

Both reject the idea that ordinary custom automatically proves moral correctness.

The disagreement is primarily about how moral reasoning should be constructed and what kinds of reasons best express concern for animals.

Key Differences at a Glance

Question	Peter Singer	Cora Diamond
Central framework	Utilitarian consideration of interests	Moral concepts, relationships and forms of life
Key animal concern	Sentience and suffering	How we see and relate to animals as creatures
Speciesism	Major form of unjustified discrimination	Critiques the way the speciesism argument frames morality
Moral status	Connected strongly to interests/capacities	Cannot be reduced to a capacity checklist
Meat and research	Often highly critical where suffering cannot be justified	Rejects a blanket argument requiring an end to all such use

Why the Disagreement Matters Beyond Animals

The debate raises a larger philosophical question: What makes a moral reason a moral reason?

Is morality primarily about applying universal principles consistently?

Or does moral understanding also depend on forms of relationship, emotion, language, and culture that cannot be completely translated into a universal formula?

This same tension appears in debates about family obligations, disability, death, care, and community.

The Risk of Bad Analogies

The original article compared speciesism with racism in a very simplified way.

Singer does use comparisons with racism and sexism to challenge arbitrary exclusion, but historical racial oppression and human-animal relations are not identical systems.

Analogies can reveal a structure of reasoning while still having important limits.

A careful essay should identify the specific feature being compared rather than claiming the situations are the same.

Animals in Scientific Research

This is one area where ethical analysis becomes highly context-dependent.

Questions include:

How much suffering is involved?
Is the research scientifically necessary?
Are alternatives available?
How strong is the expected benefit?
Are housing and care standards appropriate?
Could fewer animals be used?

Even philosophers who disagree about foundational theory may support reducing unnecessary suffering and using alternatives where feasible.

Industrial Animal Agriculture

Modern factory farming makes the debate especially practical because it can involve enormous numbers of animals and systematic welfare conditions.

Singer’s framework highlights total suffering and asks whether culinary preference can justify it.

A Diamond-style analysis may ask what our willingness to treat living creatures as production units says about our moral imagination and relationships with animals.

Different theories can therefore generate overlapping criticisms through different routes.

Vegetarianism and Veganism

Ethical vegetarianism can be supported by multiple arguments:

Reducing animal suffering.
Rejecting killing for food.
Environmental concerns.
Personal relationships with animals.
Religious commitments.

Diamond’s disagreement with Singer does not mean all vegetarians must use one particular philosophical rationale.

How to Write a Strong Essay Comparing Diamond and Singer

A good comparison should avoid saying simply “Singer cares about animals and Diamond disagrees.”

A stronger structure is:

Explain Singer’s equal-consideration/speciesism framework.
Explain why sentience matters in that framework.
Explain Diamond’s critique of capacity-based moral reasoning.
Discuss her use of human moral practices and the idea of fellow creatures.
Compare practical conclusions without pretending they always coincide.
Evaluate which theory better explains the moral concern at issue.

Questions for Critical Evaluation

Students can ask:

Does Diamond successfully explain why existing human practices deserve moral weight?
Can cultural practices themselves be morally corrupt?
Does Singer’s framework oversimplify relationships?
Does Diamond’s approach provide sufficiently clear guidance for hard cases?
Can sentience and relationship-based ethics complement each other?

For tools to evaluate such arguments, see MyArticles’ guide to critical-thinking skills and dispositions.

Frequently Asked Questions

What is Cora Diamond’s “Eating Meat and Eating People” about?

It critiques a certain style of animal-rights argument and explores how moral relationships with humans and animals depend on more than identifying capacities and applying a neutral rule.

Does Diamond agree with Peter Singer?

Not on the philosophical foundation. She argues that Singer’s attack on speciesism mischaracterizes important aspects of moral life, although both take animal mistreatment seriously.

What is Singer’s speciesism argument?

It challenges giving less consideration to comparable interests merely because a being belongs to another species.

Does Diamond support cruelty to animals?

No. Criticizing a rights or speciesism framework is not the same as endorsing cruelty. Her essay explicitly seeks another way to articulate concern “on the animals’ side.”

Why does Diamond discuss eating people?

The example shows that human moral prohibitions often depend on relationships, concepts, and practices that cannot be reduced to a simple checklist of present capacities.

Conclusion

The disagreement between Cora Diamond and Peter Singer is valuable because both force readers to examine assumptions that can otherwise remain invisible.

Singer asks whether humans discount animal suffering for an arbitrary reason: species membership. His framework emphasizes consistency and equal consideration of comparable interests.

Diamond asks whether morality can really be built by first measuring capacities and then assigning status. She emphasizes the moral significance of language, relationships, practices, and ways of seeing living beings.

The strongest reading does not turn one philosopher into the person who “cares” and the other into the person who does not. Their disagreement is about what moral concern consists of and what kinds of reasons can adequately express it. That deeper question is why “Eating Meat and Eating People” remains important in contemporary animal ethics.