Insect farming is growing rapidly as a sustainable protein source, but questions about insect sentience and the welfare implications of killing billions of animals warrant serious ethical consideration as the industry scales.
Insect welfare sits at the frontier of welfare science — a domain where the combination of scientific uncertainty about sentience and the massive scale of farming creates a genuinely difficult ethical challenge. If insects experience even a fraction of what vertebrates experience, the trillions killed annually in growing insect farming operations represent a welfare concern of enormous magnitude. If they have no subjective experience whatsoever, insect farming may represent a genuinely more ethical protein source than vertebrate farming. The honest answer is that we do not yet know. The precautionary principle — taking welfare-protective action in proportion to the probability and magnitude of potential harm — suggests that research into insect welfare should be prioritised as the industry grows, and that killing methods should be optimised for rapid unconsciousness wherever possible, at modest additional cost. The worst welfare outcome would be to scale to trillions of animals and discover retrospectively that they were sentient all along.