Cricket Protein and Shellfish Allergy: What Every Singapore Snacker Should Know

It's the question we get more than almost any other at markets and pop-ups: "I'm allergic to prawns — can I still eat cricket protein snacks?"

It's a fair question, and it deserves a straight answer rather than a marketing one. So here it is, backed by Singapore's own food regulator and the allergy science behind it.

The short answer on cricket protein and shellfish allergy

If you have a diagnosed shellfish or crustacean allergy, you should not eat cricket protein snacks unless your doctor has specifically cleared you. This isn't us being overly cautious — it's the position of the Singapore Food Agency (SFA), which states plainly that "people with shellfish and crustacean allergies may be allergic to insects as well, as some of the same kinds of allergenic proteins are found in insects."

That's the headline. But the why is worth understanding, and it explains a few things that trip people up.

Why crickets and prawns trigger the same alarm

Pull up the family tree and the connection stops being mysterious. Prawns, crabs and lobsters aren't fish at all — they're crustaceans, a branch of the phylum Arthropoda. Which is the same phylum crickets belong to. As McGill University's Office for Science and Society memorably puts it, crustaceans are "quite literally, just the bugs of the sea."

Because of that shared ancestry, they carry structurally similar proteins. The main culprit is tropomyosin, a muscle protein that the overwhelming majority of shellfish-allergic people react to. According to McGill's OSS, tropomyosin is the allergen responsible for cross-reactions between shellfish and insects including crickets, grasshoppers, locusts and even dust mites. An immune system trained to attack prawn tropomyosin often can't tell the difference when it meets cricket tropomyosin.

And no — cooking doesn't cancel it out

A common assumption is that thorough cooking should "denature" the allergen away. Unfortunately tropomyosin is unusually heat-stable. McGill notes that these proteins have very high melting points, and that heat — or even high pressure — isn't sufficient to render them non-allergenic. Baking, roasting or frying an insect snack does not make it safe for someone with a crustacean allergy.

"Sensitised" is not the same as "allergic"

Here's the nuance that gets flattened in most articles. Testing positive for shellfish IgE antibodies doesn't automatically mean you'll have a reaction.

A 2025 study published in Frontiers in Allergy examined 198 patients and found that many people without any seafood allergy were nonetheless sensitised to shellfish allergens on paper. The researchers concluded that patients sensitised to dust mites or cockroaches — extremely common in humid, tropical climates like ours — show elevated antibody levels to crab, clam and shrimp, and warned this can produce "large-scale false-positive results" in shellfish allergy testing.

The practical takeaway cuts both ways. A positive blood test alone isn't a verdict, and no test at all isn't a green light. This is exactly the sort of thing to work through with an allergist rather than a search engine — us included.

What Singapore's rules actually require

Singapore didn't wave insects through casually. The SFA only permitted the import, sale and farming of approved insect species from 8 July 2024, and only after building a full insect regulatory framework. Sixteen species are currently approved for food and feed, including several crickets.

A few of those rules matter directly to allergy-aware shoppers:

  • Labelling is mandatory. Pre-packaged foods containing insects must indicate the true nature of the product on the packaging — precisely so that consumers with allergen concerns can identify and avoid them. Misrepresenting food carries a fine of up to S$5,000.
  • Insects must be farmed, not wild. SFA requires insects to be reared in controlled environments, never harvested from the wild, to keep out diseases, contaminants and parasites.
  • The substrate is controlled. What the insects eat is regulated too — manure and rotten food are not permitted as feed.
  • Never eat insects raw. SFA advises thorough cooking to destroy pathogens, and buying only from SFA-licensed importers, manufacturers and retailers.

In other words: an insect snack sold legally in Singapore should tell you exactly what's in it. If a product is coy about containing cricket, that's a red flag on its own.

How to snack sensibly if you're unsure

A simple checklist:

  • Known prawn, crab, lobster or shellfish allergy? Skip cricket protein snacks, and speak to an allergist before reconsidering.
  • Severe dust mite allergy and never tested for shellfish? Worth a conversation with your doctor before trying insect protein for the first time.
  • No history of arthropod allergy? You're in the same position as most people — but read the label, and if it's your first time, start with a small amount rather than finishing the whole pack.
  • Buy from licensed local retailers, not overseas grey-market sellers.

Where HexaCrunch stands

We'd rather lose a sale than send someone to A&E. Every HexaCrunch® pack is clearly labelled as containing cricket protein, our crickets are farmed — never wild-caught — and our crackers are baked, never fried. We say it on the pack, on the product page, and here: if you have a shellfish or crustacean allergy, our snacks are not for you.

For everyone else, this is a genuinely different way to get protein into your afternoon — bold flavours, real crunch, no gym-bro packaging. If you're curious and allergy-free, the Try-All 3-Pack (S$12) is the low-commitment way in, with Charred Ember BBQ, Crimson Burn Paprika and Siam Blaze Tom Yum in one go. Already converted? The 5-Pack Mixed and 10-Pack Stash keep the drawer full.

This article is for general information and is not medical advice. If you have or suspect a food allergy, please consult a qualified medical professional.

References

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