Insect Farming Welfare: Scale and Uncertainty

Insect farming is growing rapidly as a sustainable protein source, with billions of insects farmed globally. The welfare implications depend on contested questions about insect sentience that current science has not resolved.

Key Facts

Global insect production for food and feed exceeds 1 trillion individuals annually, with black soldier fly, mealworm, and house cricket dominating production
Insects lack the neural structures — particularly nociceptors and a centralised pain-processing brain region — associated with pain experience in vertebrates
However, some insects show nociception (detection of harmful stimuli) and there is limited evidence of learning from noxious stimuli in some species
The UK Farm Animal Welfare Council has reviewed evidence and concluded that current evidence is insufficient to definitively establish or exclude insect sentience
Farming density in insect production is extreme by any comparison — black soldier fly larvae are farmed at densities of 60,000-100,000 per square metre

Welfare Considerations

Insect welfare presents the most genuinely uncertain case in animal welfare science. The case for insect sentience is weaker than for vertebrates or crustaceans, but it cannot be definitively excluded for all species in all contexts. The precautionary principle applied to welfare suggests that the enormous scale of insect farming warrants at least investigation of practices that might reduce any potential suffering. This includes the method of slaughter (chilling, freezing, or hot water are options), rearing density, substrate quality, and whether crowding at extreme densities causes any distress-like state. As the industry grows, developing welfare standards that are proportionate to the evidence while acknowledging uncertainty is more defensible than ignoring the question entirely.

What You Can Do

Support research into insect sentience and nociception that will help resolve current uncertainty about their welfare status
Engage with insect welfare science rather than dismissing it — the scale of production makes this an important frontier
Choose insect protein products from producers who have engaged with welfare questions in their production design
Advocate for insect welfare to be included in agricultural welfare research agendas given the rapid growth of the sector
Apply the precautionary principle: prefer slaughter methods and density standards that would reduce any potential suffering if insects do have welfare-relevant experience