The question of insect sentience has moved from philosophical speculation to empirical research, with several lines of evidence suggesting some form of pain-relevant experience in insects.
Insect sentience remains genuinely scientifically uncertain, but the uncertainty itself has welfare implications. If there is a meaningful probability that insects experience pain or suffering, and if they are farmed in billions and killed in trillions, the expected scale of potential welfare impact is enormous. The precautionary argument — that we should take steps to minimize potential insect suffering even under uncertainty — is gaining ground in policy and welfare circles. Practical implications include preferring killing methods that are rapid and potentially less painful, avoiding extreme crowding in insect farms, and investing in research to reduce uncertainty. These steps are low-cost and defensible even if insects ultimately prove non-sentient.