Living with celiac disease sometimes feels like being a full-time detective. We spend our lives scanning ingredient lists, questioning restaurant staff, and analyzing the logistics of shared kitchens. In this pursuit of safety, language can be one of our most crucial tools. It’s part of why so much of my work during the last decade has focused on giving my readers language resources to travel safely as celiacs.
I’m also a lawyer who loves words. I spent my legal education learning about how small changes in definitions can affect outcomes. While I no longer practice, as a celiac I’ve learned how precision in language can also help keep me safe while eating gluten free.
Since my celiac disease diagnosis in the early 2000s, there have been changes in the discussion of risks around food and allergens. For most of the modern era, food safety was specific to microbiology, focusing on pathogens in foods and prevention of foodborne illnesses like Salmonella or Listeria. But in the last 25 years, the increase in severe food allergies and the prevalence of celiac disease have led to a more precise wording for the distinct risks patients face for when foods have contact with ingredients that they are reactive to — like gluten.
Why am I writing a whole piece about cross-contact vs cross-contamination?
I run a celiac group about international travel, and to enter the group we ask if a person avoids cross-contact with gluten. About half of the entries say something like, “if you mean cross-contamination, then yes”. A particularly snarky reply this week from someone wanting to join the group is what prompted me to write this post. Interestingly enough, that person was from Australia, a country that helped lead the charge in shifting toward cross-contact.
As celiacs know well, the disease is a chronic, multi-system autoimmune disorder triggered by the ingestion of gluten. Unlike traditional food poisoning that arises from ingesting harmful parasites, bacteria, or other microorganisms, the damage in celiac disease is caused by the body’s own immune system reacting to a specific protein found in wheat, barley, and rye. I wanted to share why I think the push toward use of “cross-contact” is a more effective health and safety practice for celiacs: the more precise we can be in how we discuss food preparation and the needs we have as a group, the safer we can be while eating.
In 2026, many patients, restaurant staff, and even some healthcare professionals use the term “cross-contamination” when referring to gluten, especially here in Canada where we lag behind the shift in terminology. While I do agree that the intent is fairly clear, as I explain below the term “cross-contact” better distinguishes allergens and/or gluten from bacteria and chemicals, and helps ensure that anyone preparing my food is using the protocols I need to keep me safe.
I believe that using both terms interchangeably, or only using cross-contamination, can lead to confusion, unsafe food handling practices, and for those of us with celiac disease, some real harm. How we communicate about food allergy or restrictions is materially relevant to patient safety.
Defining the terms
Cross-contamination was historically used as a catch-all for any unwanted or harmful substances in food like metals, chemicals, or bacteria. The term cross-contact was introduced more recently, to specifically distinguish allergens and gluten.
In contrast to metals or harmful bacterial, allergenic food residues or proteins like gluten are nutritious ingredients that only become hazards to a subset of the population when they touch a product intended for that group. Gluten is not inherently harmful to everyone (though I know some people claim it is); Salmonella on the other hand — no one wants that in their food. While those allergenic food residues create medical consequences in those of us with conditions like celiac disease or people with allergies, they are otherwise encouraged for consumption.
To explain further:
- Cross-contamination refers to the transfer of harmful microorganisms like bacteria, viruses, or parasites from one food or surface to another. For example, if a chef cuts raw chicken on a cutting board and then uses that same board to slice a tomato, the tomato is then potentially cross-contaminated with Salmonella or E. coli.
- Cross-contact refers to when a food with an allergen or storage protein like gluten touches a gluten free ingredient or food. This happens via shared fryers where the oil used can have contact with gluten, on shared cutting boards, or via cooking implements that have already cooked gluten-containing foods.
Where did the terms “cross-contamination” and “cross-contact” come from?
Buckle up, because it’s not a Legal Nomads article if we don’t dive into the etymology and history of what we’re reading about. I wanted to try and see where the two terms started getting conflated.
Traditionally, a “contaminant” is something that is inherently harmful to the entire population, such as Salmonella, Listeria, or E. coli. The term “contamination” finds its roots in the Latin contaminare, which initially referred to the act of defiling, polluting, or making something impure by contact with an outside, usually infectious, substance.
In the USA, the Pure Food and Drug Act of 1906 (Public Law 59-384) noted that if food contained “filthy, decomposed, or putrid” items, or had added poisonous ingredients, it was “adulterated”. By the late 19th and early 20th centuries, as the work of Louis Pasteur and Robert Koch solidified germ theory, adulterated foods became known as contaminated foods due to the germs and spoilage they implied.
Since that law in 1906, and moving into our modern era and the many industrial kitchens and warehouses it comprises, “contamination” was the catch-all term for anything that shouldn’t be in your food, whether it was glass, chemicals, or Salmonella.
The term cross-contact came alongside a newer awareness of food allergies and safe food preparation in light of how much they’ve increased in last fifty years. The Latin contactus means a simple touching or a physical connection, and helps people working in food handling or manufacturing best understand the problem, as it is about having had some contact with the allergen or protein most of all.
The historical evolution of these two terms reflects the general evolution in fields like immunology and medicine. While researchers believe that celiac disease first began in humans at the advent of the first agricultural revolution, it was ‘medically identified’ in its modern form by Dutch physician Dr. Willem-Karel Dicke in the 1940s. He hypothesized that wheat protein may be the culprit in triggering celiac disease during WWII, when during the Dutch Famine bread was no longer available for consumption in the country. He noticed that, during those years, the mortality rate for celiac dropped to zero in his hospital. He was the first physician to develop a wheat-free diet for patients.
Following the modern identification of celiac disease, the food industry used the language of pathogens (“contamination”) to describe gluten for decades. It wasn’t until the early 2000s that regulatory bodies began to separate allergen management from general food safety.
A shift toward cross-contact
As noted above, Australia and New Zealand were among the first to champion the change. In 2002, the Australia New Zealand Food Standards Code introduced mandatory declaration requirements for common allergens. However, the most significant contribution to terminology came from the Allergen Bureau, an industry-led initiative that launched the Voluntary Incidental Trace Allergen Labelling (VITAL) program in 2007, which provided a standardized, science-based risk assessment process for managing “cross-contact allergens”.
As of publication, Australia and New Zealand guidance on labelling for food manufacturing, including for cereals containing gluten, specifically notes allergen cross-contact.
In the United States, the shift came with the U.S. Food and Drug Administration (FDA)’s Food Safety Modernization Act (FMSA) in 2015. Under the FSMA, the FDA formally defined and adopted ‘allergen cross-contact’ as a distinct regulatory term, differentiating it from microbial cross-contamination.
Leading up to the adoption of the FSMA, food allergy advocacy groups in the USA such as Food Allergy Research & Education (FARE) pushed for a revision to the existing language about contamination in order to be more precise in training staff and serving food to patients with allergenic restrictions. In a series of FDA and state inspection surveys conducted in 1999 and 2000, for example, investigators found that a substantial proportion of sampled foods contained undeclared peanut or egg residues, often due to shared equipment, despite manufacturers’ sanitation protocol. The existing safety protocols did not prevent this cross-contact with allergens, with the result being that patients would be exposed to triggers. The conclusion and subsequent lobbying about risk to patients ultimately led to the passage of the Food Allergen Labeling and Consumer Protection Act (FALCPA) in 2004.
And to me, the shift makes great sense.
In the realm of medical food management, a peanut or a grain of wheat is not a “pollutant” or “filth”, right? Many people eat them as part of a standard, healthy diet. The risks arise only to those of us who are a vulnerable subset of the population with respect to that ingredient. A product that is unintentionally in contact with an allergen is not necessarily “poisoned” for the general public, though saying as much is evocative.
Use of “cross-contact” as a technical term is a deliberate attempt to describe something different to contamination: the unintentional transfer of an (often nutritious!) food ingredient into another food product. This distinction, adopted in countries like Australia, New Zealand and the US, allows regulators to issue recalls that are specifically targeted toward protecting those vulnerable populations without suggesting that there’s something ‘contaminated’ or wrong with the general food supply. In FARE’s handout about avoiding cross contact, they specifically note that:
Cross-contamination is when bacteria or viruses get in your food and make it unsafe to eat. When this happens, cooking the food removes the bacteria or virus and lowers your chances of getting sick.
This is not the same as cross-contact with food allergens. The cooking process does not remove allergens from food.
In January 2026, the FDA issued a Request for Information seeking public input on how gluten and related ingredients are disclosed on packaged foods, with an explicit focus on gluten presence and allergen cross-contact involving wheat, barley, rye, and oats. I mention this because the FDA’s announcement uses the term “cross-contact” and does not refer to gluten exposure as “cross-contamination,” reinforcing the agency’s continued distinction between allergen risk and microbial contamination.
Canada lags behind in formally adopting cross-contact
In my country of Canada, the terminology used for the unintentional presence of an allergen or gluten in a food unfortunately remains “cross-contamination” for most of the consumer-facing and industry documentation. According to Health Canada and the Canadian Food Inspection Agency (CFIA)’s guidance, a gluten-free claim on packaged food must comply with regulatory requirements including controls against “cross-contamination with gluten or ingredients containing gluten.” That guidance hasn’t been updated since 2012. This language is also embedded in official labeling requirements.
Less technical public-facing guidance from Health Canada also defines cross-contamination broadly as the “accidental transfer of an ingredient (food allergen or gluten source)” to food that does not normally contain it, and instructs Canadians with celiac disease to watch for “cross-contamination” when reading labels.
Consumer-facing materials from organizations like Celiac Canada and Food Allergy Canada similarly use “cross-contamination” or they use both terms together (e.g. “cross-contact or cross-contamination”).
However, in recent years the CFIA has begun to use “cross-contact” in technical, industry-facing documents — even as high-level policy remains (in my opinion) dated. The Safe Food for Canadians General Guide is used by industry to comply with The Safe Food for Canadians Act, which came into effect on January 15, 2019. It defines cross-contact as, “when an allergen is inadvertently transferred from a food containing an allergen to a food that does not contain an allergen or does not contain the same allergen.” In addition, the Canadian Food Inspection Agency’s “Preventive controls for food allergens, gluten and added sulphites” defines cross-contact as the “inadvertent, unintentional transfer of residues of an allergenic food into another food” and provides an exhaustive list of “areas where cross-contact can occur,” such as shared processing lines, dust, aerosols, and the reuse of cooking oil. There is no definition for cross-contamination in the document, though the term is used in the classic context of personal hygiene to “prevent contamination of the food” they are preparing.
The CFIA’s Targeted Surveys, where the agency tests food for undeclared allergens or gluten, is an example of how language can confuse. In a 2022-2023 Targeted Survey, “Undeclared allergens and gluten in plant-based food products”, they use cross-contamination to discuss gluten findings, cross-contamination or cross-contact for soy, and cross-contact for eggs except when referring to contaminated raw ingredients (and bacterial concerns).
This gap between industry rules and public communication is exactly why we need to advocate for a single, scientifically accurate standard. Until such a shift occurs in the regulations or standard food safety texts, the less precise term of cross-contamination will continue to be used in Canadian materials for gluten exposure, even though for many people with celiac disease the term cross-contact more accurately describes the mechanism of gluten transfer.
What about Europe and the UK?
The European Union has taken a somewhat different path. Regulation (EU) No 1169/2011, on the Food Information for Consumers Regulation, is the central pillar of European allergen management. While it is highly effective at mandating the declaration of 14 key allergens, and as celiacs can attest eating gluten free products in Europe is made easier due to standardized packaging and regulations, they do not explicitly mandate the use of either term.
As a result, European regulatory bodies and guidance documents, including those from the European Food Safety Authority, often use both terms interchangeably. Some documents refer to “allergen cross-contamination” to describe the risk in restaurant settings, while others use “cross-contact” when discussing industrial threshold values.
In the UK, the Food Standards Agency fuses both terms to mean the unintentional incorporation of a food allergen into a food.
Why does it matter?
You may be asking yourself why I’ve devoted over 3000 words to this topic. It can seem semantic, or pedantic, to insist upon these differences since both expressions do involve an ‘unwanted something’ getting into our food. Is it really that important to distinguish between the two terms for celiacs?
In my opinion, yes. From a practical, medical, and safety perspective, I do believe that using cross-contact minimizes the likelihood of misunderstandings about the cause of the harm to celiac patients. As FARE’s definitions imply, a misconception that abounds is the idea that the risks of cross-contact can be eliminated through heating. For foodborne illnesses, cross-contamination can often be neutralized by heat; cooking food to the proper internal temperature kills most pathogens, although not all.
Unlike bacteria, gluten is a protein, not a living organism and though some people say cooking will make a product safe for celiacs that is not true: you cannot “kill” gluten with heat. If a chef uses a shared fryer to cook both wheat-breaded onion rings and french fries, the fries have undergone cross-contact. No amount of time in the hot oil will neutralize the gluten in them; gluten is a resilient protein that does not “die” when heated. The fries are still capable of triggering an autoimmune reaction to someone with celiac disease. It’s the same for other allergens; cooking ‘away’ the peanuts won’t make a dish safe for a person who is allergic to them.
This distinction is a big part of why I’m beating this “words matter” drum. Contamination implies a biological problem that can be cooked away, whereas contact describes a physical presence that must be physically removed or avoided entirely.
In addition, as an individual with celiac disease, I like the precision of “cross-contact”. It reflects the sensitivity of our immune systems, and unlike in foodborne illnesses where someone likely recovers fully in a few days, the systemic inflammatory response that follows accidentally ingesting gluten can lead to tissue damage.
I’m but one celiac patient, but I have concerns that using cross-contamination for both celiac restrictions and general food safety may lead to food workers conflating the two, and erroneously working under the assumption that a surface is “safe” once it has been wiped down with a sanitizer that kills bacteria. Using precise terminology ensures that the focus remains — as it should! — on either dedicated spots for preparing foods without gluten, or on thorough proper cleaning procedures instead of just chemical disinfection.
A specific form of cross-contact that highlights the need for precise language is “agricultural commingling.” This refers to the mixing of gluten-containing grains with naturally gluten-free crops before they ever reach a processing facility. This can happen due to wind or birds carrying seeds between adjacent fields, or more commonly, through the use of shared harvesters, transport trucks, and storage silos. Surveys indicate that a substantial proportion of manufacturers report allergen incidents related to shared equipment, making the management of cross-contact a daily technical challenge. Multiple studies have also documented that naturally gluten-free grains can exceed 20 ppm of gluten due to agricultural commingling and shared infrastructure. A large Canadian market survey showed that approximately 9.5% of naturally gluten-free flours/starches were above 20 ppm gluten, consistent with contamination occurring during production or supply chain handling.
By using the term “cross-contact,” the food workers and the manufacturing industry can acknowledge that these risks are an inherent part of the physical supply chain and must be managed through specialized testing and separation, instead of just sanitation.
This is also why my celiac guides and detailed celiac translation cards include a warning about cross-contact, not cross-contamination. I fear that using cross-contamination blurs the boundary between transfer of gluten and traditional contamination by bacteria or other pathogens, and I went with the evolution of the vocabulary around celiac disease.
Words matter in public health
For someone like me with celiac, the linguistic shift from the broad umbrella of “cross-contamination” to the clinical precision of “cross-contact” is an important victory for public health. It has direct, beneficial consequences. It better ensures that whoever is preparing my meal, whether in a restaurant or home kitchen, or a manufacturing plant, understands that they are managing a resilient protein (gluten), not a delicate bacterium. It moves the focus away from the confusing language of “pollution” in food, toward the technical language of “separation” and “removal.”
I hope that with time, persistence of interchangeable terms in Europe and in Canada will diminish and cross-contact will be adopted as the appropriate term globally. Uniformity in language can help refine the needs of our growing patient population. And language is an excellent tool in public health to help keep us safe.
The next time you find yourself at a restaurant or explaining your needs to a friend, please consider using the term “cross-contact.” It is an opportunity to educate and to emphasize that for a celiac, even the smallest crumb is a physical reality that heat cannot erase. By choosing our words carefully, we ensure that our safety is taken as seriously as the science behind it.
Signed, a celiac who loves words,
References:
AIB International. “Understanding Allergen Cross-Contact: What Every Food Facility Should Know.” AIB International, 2024.
Allergen Bureau. “History of VITAL.” Allergen Bureau, 2007.
Beyond Celiac. “Cross-Contact vs. Cross-Contamination.” Beyond Celiac, 2025.
Canadian Food Inspection Agency. “Allergen-Free, Gluten-Free and Cross-Contamination Statements.” Government of Canada, 2025,
Celiac Canada. “Food Labelling: Guidelines for Individuals with Celiac Disease Following a Gluten-Free Diet.” Celiac Canada, 2023.
European Union. Regulation (EU) No 1169/2011 on the Provision of Food Information to Consumers. 2011.
Food Allergy Research and Education (FARE). “Avoiding Cross-Contact.”
Food Allergy Research and Resource Program (FARRP). “The Concept of Cross Contact.” University of Nebraska–Lincoln, 2026.
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Health Canada. “Co-Mingling in Agricultural Grain Products as a Possible Source of Food Allergens.” Government of Canada, 2017.
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Health Canada. “Preventive Controls for Food Allergens, Gluten and Added Sulphites.” Government of Canada, 2020.
Koerner, Terence B., et al. “Gluten Contamination of Naturally Gluten-Free Flours and Starches Used by Canadians with Celiac Disease.” Food Additives & Contaminants: Part A, vol. 30, no. 12, 2013, pp. 2017–21. doi:10.1080/19440049.2013.840744.
Merriam-Webster. “Cross-Contamination.” Merriam-Webster Dictionary, 2025,
National Celiac Association. “Does Heat Kill Gluten?” National Celiac Association, 2025,
Öcal, Hacer Yalçimin, and Hülya Gökmen Özel. “Naturally Gluten-Free Flours Are Commonly Contaminated, While Commercially Produced Gluten-Free Flours Are Relatively Safe: A Market-Based Study in Turkey.” Frontiers in Nutrition, vol. 12, 2025, article 1707584, 11 Dec. 2025. doi:10.3389/fnut.2025.1707584.
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Sheehan, William J., et al. “Environmental Food Exposure: What Is the Risk of Clinical Reactivity from Cross-Contact and What Is the Risk of Sensitization?” Journal of Allergy and Clinical Immunology: In Practice, vol. 6, no. 6, 2018, pp. 1825–32. doi:10.1016/j.jaip.2018.08.001.
U.S. Congress. Food Allergen Labeling and Consumer Protection Act. Public Law 108-282, 2004.
U.S. Congress. Food Allergy Safety, Treatment, Education, and Research (FASTER) Act. Public Law 117-11, 2021.
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U.S. Food and Drug Administration. “Current Good Manufacturing Practice, Hazard Analysis, and Risk-Based Preventive Controls for Human Food”. 21 CFR Part 117, 2015.
U.S. Food and Drug Administration. “FDA Takes Steps to Improve Gluten Ingredient Disclosure in Foods.” FDA News Release, 21 Jan. 2026.
