Meat Glue — The Food Additive Your IgG Test Can Now Detect

There is a food additive in widespread use in the food manufacturing and catering industry that most consumers have never heard of, that does not appear under a recognisable name on most ingredient lists, that is present in a broad range of processed and restaurant meat products, and that is now testable for individual IgG reactivity for the first time on the HealthBeings IgG food panel (286 foods).

M-transglutaminase. Known in the food industry as “meat glue.” An enzyme that binds pieces of meat, fish, and other proteins together so completely that the join is undetectable after cooking. It has been in commercial use since the 1990s. It has been approved for food use in the UK, EU, US, and most major markets. And until the HealthBeings IgG food panel (286 foods), there was no commercially available food sensitivity test that included it.

What Meat Glue Is and Where It Is

Transglutaminase is an enzyme that catalyses the formation of covalent bonds between glutamine and lysine residues in protein chains — the same chemistry used by the body to cross-link fibrin in blood clotting and to cross-link proteins in skin and hair. Microbial transglutaminase (mTG, M-transglutaminase) is produced by Streptoverticillium mobaraense and used commercially to bind protein pieces into uniform portions that behave like a single cut of meat during cooking.

Where it is used:

Catering and restaurant meat portions — standardised chicken breast portions, restructured beef steaks, and formed protein products in volume catering are commonly produced using mTG to ensure consistent weight and shape. A restaurant steak labelled as a single cut may be multiple pieces bonded with mTG. This is legal and does not require specific declaration in most catering contexts.

Processed meat products — reformed ham, restructured turkey, deli slices, and formed sausage products use mTG to bind trim meat into uniform portions. It may appear on ingredient lists as “enzyme,” “transglutaminase,” or simply as a “processing aid” that does not require declaration if it is considered to perform no function in the final product.

Fish products — imitation crab (surimi), restructured shrimp, and formed fish portions use mTG to bind flaked fish or shellfish into uniform shapes.

Dairy and bakery — mTG is used in some yoghurt and cheese production to improve texture and reduce syneresis, and in bakery applications to strengthen gluten networks.

The Coeliac Connection

There is an emerging and concerning body of research suggesting that M-transglutaminase may play a role in coeliac disease pathogenesis and in non-coeliac gluten sensitivity. The mechanism proposed: mTG can deamidate gliadin peptides in a manner similar to tissue transglutaminase (tTG-2, the autoantigen in coeliac disease), potentially generating immunogenic peptides from dietary gluten that would not otherwise be immunogenic. Additionally, mTG-gliadin complexes may be more immunogenic than native gliadin alone.

This research does not establish that mTG causes coeliac disease. It raises the possibility that widespread mTG use in food manufacturing may be a contributing factor in the increase in coeliac disease and gluten sensitivity prevalence over recent decades — which has occurred in parallel with the increase in mTG use in the food industry and cannot be fully explained by improved diagnosis alone. This remains a hypothesis under investigation, not an established mechanism. But it is a clinically relevant hypothesis for practitioners working with gluten sensitivity and autoimmune conditions.

The Labelling Gap

Current UK and EU food labelling regulations require declaration of the 14 major allergens. M-transglutaminase is not one of them. When used as a processing aid — meaning it performs its function during manufacturing but is not present (or present only in minute quantities) in the final product — it does not require declaration. When present as a functional ingredient, it must be declared but may appear simply as “enzyme” without specifying which enzyme.

In practice, a consumer attempting to avoid M-transglutaminase through label reading alone faces significant challenges: it may not be declared, it may not be recognisably named when it is, and there is no reliable way to identify which catering meat products have been reformed using it without asking specifically. This is not unique to mTG — it is a feature of the processing aid category in food regulation — but it makes IgG testing the only practical way to identify reactivity and elimination the only reliable way to avoid it (by choosing obviously intact, unprocessed meat cuts rather than reformed or standardised portions).

This is a food additive that is present in a significant proportion of the processed and catering meat products consumed in the UK, that does not have to be labelled, that cannot be identified through dietary observation, and that has now been tested for individual IgG reactivity for the first time. The clinical implication: symptoms attributable to meat consumption that don’t resolve with standard meat elimination may be driven by the processing, not the protein.