Whether insects can suffer is one of the most consequential open questions in animal welfare science. Recent research provides new evidence that demands ethical consideration.
The insect sentience debate has profound welfare implications given the astronomical numbers involved. Conservative estimates suggest one trillion insects are killed annually across agriculture, insect farming, and pest control — if even a small fraction experience genuine suffering, the aggregate welfare impact dwarfs that of vertebrate animal agriculture. The emerging scientific consensus is cautiously supportive of minimal sentience in at least some insect species, with bees and flies showing the strongest evidence. This has prompted several major insect welfare research programs (Rethink Priorities, Cambridge Centre for the Study of Existential Risk) and early policy discussions. Practically, this means that insect farming standards should consider killing methods (heat, freezing, or CO2 each have different welfare profiles), and that insecticide use deserves ethical scrutiny alongside its environmental impacts.