Don't plants feel pain too?

The objection

“Plants are alive. They sense light, respond to touch, signal when damaged, even warn their neighbours. If suffering is what makes harm wrong, take plant suffering seriously too, and the line between a carrot and a cow starts to look arbitrary.”

The answer

The instinct is fair: if pain is what matters, don’t assume in advance which beings feel it. So look at what feeling requires. Pain is a conscious experience, and consciousness needs machinery plants entirely lack: a centralised nervous system, a brain, and nociceptors, the receptors that register damage. A 2019 review in Trends in Plant Science concluded plants neither possess nor require consciousness, and that what’s billed as plant “intelligence” is reflexive signalling rather than felt experience [1]. A plant reacting to damage is no more in pain than your knee is when a doctor taps it.

Now grant the objection anyway. Suppose plants did feel. The conclusion would still favour plants, decisively. Farmed animals are fed crops, and they convert them inefficiently: across calories and protein, beef returns only about 3% of what’s fed in, the least efficient of any food studied [2]. The animal on your plate has already eaten many times the plant matter you’d consume directly. This is why livestock occupy roughly 80% of the world’s agricultural land while supplying a small fraction of global calories [3]. Routing plants through an animal destroys far more of them.

So the objection cuts the other way. If you genuinely cared about plant death, the diet that minimises it is the one that eats plants directly. The argument that begins by worrying about the carrot ends by recommending the carrot.