Insect Welfare: Emerging Science and Ethical Implications for Mass Production

As insect farming grows rapidly to supply animal feed and human food, questions about insect sentience and welfare demand serious scientific and ethical attention.

Key Facts

Insect production for food and feed has grown dramatically, with over 400 species farmed commercially
Black soldier fly (Hermetia illucens) and mealworm larvae (Tenebrio molitor) are the dominant farmed insect species globally
Approximately 1 trillion insects are farmed annually — a number that dwarfs all vertebrate animal production combined
Insect nervous systems differ significantly from vertebrates, but nociceptive responses have been documented in many species
The probability of insect sentience is scientifically contested, but precautionary consideration is increasingly advocated
Stunning methods for insects including CO2 and cold anesthesia are being developed and evaluated for commercial use
Some research suggests bees and other insects have emotion-like states and can be pessimistic or optimistic
The environmental benefits of insect protein — lower land use, water use, and emissions — are well established

Welfare Considerations

Insect welfare presents one of the most philosophically challenging questions in animal ethics. The scale of insect farming is enormous, and even a small probability of suffering per individual translates into staggering aggregate concerns. At the same time, the evidence for insect sentience is considerably weaker than for vertebrates or cephalopods. A responsible approach applies proportionate precaution: investing in research to clarify insect sentience, developing and adopting welfare-positive practices where these are low-cost and available, and making regulatory frameworks flexible enough to incorporate welfare requirements as evidence evolves. The risk of dismissing insect welfare entirely is that we may be causing suffering on an unprecedented scale without scrutiny; the risk of overstating it is diverting attention from species whose sentience is better established.

What You Can Do

Support research into insect neuroscience and welfare that can inform evidence-based policy decisions
Engage with insect farming certification bodies to ensure welfare considerations are included in developing standards
Apply proportionate precaution — support low-cost welfare improvements for farmed insects where evidence suggests benefit
Advocate for insect welfare to be included in the mandate of national animal welfare regulatory bodies
Follow the work of Rethink Priorities and other organizations that research the moral weight of invertebrate suffering
Choose insect protein products from producers who publish their welfare and stunning practices
Support the development of voluntary welfare certification for the insect farming industry