At What Point Do Atoms Become Capable of Suffering?

Some personal reflections on matter, consciousness and the moral questions hidden in an ordinary meal.

A thought keeps returning to me: if a vegetable, an animal and I are all made of atoms, why does it matter where the atoms on my plate come from?

At the level of their constituent elements, atoms carry no labels saying “vegetarian” or “non-vegetarian.” A carbon atom is a carbon atom.

Yet a stone cannot suffer in any way we have evidence for. A living animal can be frightened, injured and distressed.

So somewhere between the ingredients and the living being, something profoundly important changes.

At what point does matter become capable of experiencing what happens to it?

The same ingredients, a different reality

Sharing basic ingredients does not mean sharing the same properties.

Carbon can be part of graphite, a diamond or a living cell. Its arrangement and interactions matter. In living organisms, atoms form molecules, cells and systems whose activities depend on how those parts work together.

The question, then, is not whether an individual atom feels pain. There is no established scientific evidence that it does.

The question is whether a particular organisation of matter can support a being that feels.

To say “it is all atoms” tells us something about composition. It does not tell us everything about experience.

Responding to harm is not the same as feeling pain

This distinction matters.

A device can detect heat and trigger an alarm. That does not establish that it feels anything.

Biology also distinguishes between detecting harmful stimuli and experiencing pain. Nociception is the nervous system’s encoding of potentially damaging stimuli. Pain is an unpleasant sensory and emotional experience. The International Association for the Study of Pain explicitly distinguishes the two.

A response alone therefore cannot settle the question of suffering.

Nor does an inability to speak establish an inability to feel. An animal need not describe its distress in our language for that distress to deserve consideration.

Here, I use suffering to mean an unpleasant felt experience, physical pain, fear or distress --- not merely damage to living tissue.

Where is the boundary?

We do not have an agreed scientific threshold at which a collection of atoms becomes conscious.

There is no known number of atoms, neurons or connections that provides a universal dividing line.

But uncertainty does not mean that we know nothing.

The 2024 New York Declaration on Animal Consciousness describes strong scientific support for conscious experience in mammals and birds. It also recognises a realistic possibility in all vertebrates and many invertebrates, including octopuses, crabs and insects.

That is not proof that every animal experiences the world as we do. It is a reason to take their possible experiences seriously.

We can remain uncertain about how consciousness arises while recognising evidence that other beings can feel.

But plants are alive too

They certainly are.

Plants detect changes in their environment, respond to injury and transmit chemical and electrical signals. Their lives are far more intricate than their apparent stillness suggests.

However, responding to damage is not itself evidence of consciously experiencing pain. Plants have no neurons or nervous systems, and current evidence does not establish that they suffer.

This does not make plants unimportant. It means that being alive and being capable of suffering are different questions.

Treating every biological response as pain would erase the very distinction we are trying to understand.

What does this mean for food?

My original question was about vegetarian and non-vegetarian food. Perhaps its answer lies less in the atoms we consume than in the experiences of the beings from which that food comes.

The ethical concern is not that animal atoms are somehow morally different from plant atoms.

It is that obtaining food can affect a being capable of fear, pain or distress.

That does not settle every question about diet. Food choices also involve health, circumstances, culture and access. Nor does any diet guarantee an existence without harm.

But it gives us a meaningful question to ask:

Where we have a practical choice, can we reduce the suffering our choices cause?

Matter matters differently when it can feel

Calling pain “subjective” does not make it imaginary.

It means that pain is experienced from the perspective of the being undergoing it. My pain is subjective too. That does not make it insignificant.

Perhaps this is where my thought about atoms needed to go further.

The atoms themselves may be indifferent. But the living being they form may not be.

I still do not know exactly how matter becomes experience. That remains one of the deepest questions we can ask.

Yet I do not need to solve consciousness before taking another being’s suffering seriously.

Perhaps compassion begins when we recognise that what is merely matter to an observer may be an entire felt world to the being living it.

-Ash

Sources and further reading

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