Cricket Protein and Shellfish Allergy: What the Evidence Actually Says

One of the most common questions we get is also one of the most important, and it deserves a straight answer rather than a marketing one: if you are allergic to prawns, crab or shellfish, can you eat cricket protein?

The honest answer is probably not — and you should not try without speaking to your doctor first. Here is why, according to the actual safety assessments and published research.

The problem is a protein called tropomyosin

Crustaceans such as prawns and crabs, molluscs, dust mites and insects are all arthropods or closely related invertebrates. They share a family of structurally similar muscle proteins, and one of them — tropomyosin — is the single best-known allergen in shellfish.

Crickets contain tropomyosin too. Because the immune system recognises shapes rather than species names, antibodies primed against prawn tropomyosin can also latch onto cricket tropomyosin. That phenomenon is called cross-reactivity, and it is the core of the concern.

What the European food safety assessments concluded

The European Food Safety Authority (EFSA) has assessed house cricket (Acheta domesticus) products as novel foods more than once. In its 2021 opinion on frozen and dried formulations from whole house crickets, the EFSA panel concluded that the food was safe under the proposed conditions of use, but explicitly noted that allergic reactions may occur in people allergic to crustaceans, molluscs and dust mites because of cross-reactivity.

EFSA reached a comparable conclusion in its later assessment of Acheta domesticus powder, adding that consumption might also trigger primary sensitisation — meaning a person with no prior shellfish allergy could, in principle, become allergic to cricket protein itself. The panel also recommended that more research be done specifically on cricket allergenicity. That is a genuine open question, not settled science.

Cooking does not solve it

A reasonable assumption would be that baking or high-heat processing destroys the offending protein. Tropomyosin is unusually stubborn about this. A 2021 study in Food Chemistry, Allergenicity assessment of the edible cricket Acheta domesticus in terms of thermal and gastrointestinal processing and IgE cross-reactivity with shrimp, identified tropomyosin as the most relevant IgE-binding protein in crickets and demonstrated cross-reactivity with shrimp tropomyosin. Notably, cricket tropomyosin survived simulated digestion better than shrimp tropomyosin did, and IgE-binding proteins in a model baked product were partially protected from breakdown.

In plain terms: heat and digestion are not a reliable off switch. Anyone telling you that baking makes cricket protein safe for shellfish-allergic eaters is going beyond the evidence.

What Singapore's rules require

Since 8 July 2024, the Singapore Food Agency (SFA) has permitted the import, sale, manufacture, processing and farming of 16 insect species assessed as safe for human consumption, including several cricket species. Products outside that list must go through SFA's novel food evaluation.

Two parts of the framework matter to you as a shopper. First, as FoodNavigator-Asia reported, companies selling pre-packaged food containing insects must declare the insect as an ingredient on the label so the true nature of the product is clear. Second, ready-to-eat imported insect products require a health certificate confirming sufficient heat treatment or an equivalent process to kill pathogens.

As Mothership noted at the time, misrepresenting the true nature of food sold is an offence under the Sale of Food Act. SFA's own position is that consumers should make an informed decision based on the information provided on the product.

So the practical upshot is reassuring in one narrow way: in Singapore you should not encounter insect protein accidentally. It has to be on the ingredients list. Read it.

Practical guidance

• Diagnosed crustacean, mollusc or shellfish allergy? Treat cricket-containing products as off-limits unless a doctor who knows your history tells you otherwise. Do not self-test.
• Severe dust mite allergy? The same cross-reactivity family applies. Worth raising with your doctor.
• No known allergy? The assessed products are considered safe under normal conditions of use, but as with any new food, start with a small amount.
• Buying for someone else? Check the ingredients panel, not the front of pack. Under SFA rules the declaration must be there.

Why we would rather tell you this

It would be commercially convenient to skip this article. We think the opposite is true. A food category that grows on the back of vague reassurance is one bad reaction away from losing public trust, and the people most likely to be hurt are the ones who trusted a label that did not warn them.

Where HexaCrunch fits

HexaCrunch baked brown-rice crackers are made with cricket protein, and we say so on the pack and in the ingredients list, as SFA requires. If you have a shellfish, crustacean or mollusc allergy, our crackers are not the snack for you — please give them a miss. If you do not, and you are curious about what a high-protein, wholegrain-based cracker tastes like, the Try-All 3-Pack is the easiest way to sample all three flavours in one go.

Sources

• EFSA — Safety of frozen and dried formulations from whole house crickets (Acheta domesticus) as a Novel food (2021)
• EFSA — Safety of Acheta domesticus powder as a Novel food (2024)
• Food Chemistry — Allergenicity assessment of the edible cricket Acheta domesticus in terms of thermal and gastrointestinal processing and IgE cross-reactivity with shrimp (2021)
• FoodNavigator-Asia — Singapore Food Agency emphasises food safety and labelling transparency in new Insect Regulatory Framework
• Mothership — Import, sale & consumption of some insects including crickets & mealworms allowed in S'pore from Jul. 8

This article is general information, not medical advice. If you have a diagnosed food allergy, speak to your doctor or an allergy specialist before trying any new protein source.