25 Foods Celiacs Get Wrong About Gluten (+ Safe Surprises)

Let’s start with one that still gets people: hotel breakfast buffet scrambled eggs.

Not from cross-contamination. The eggs themselves — they’re baked with flour added in to make them fluffy. Same goes for the omelets at IHOP, which use pancake batter in the mix. Totally standard practice. Almost nobody tells you until you’ve already eaten them.

That’s the pattern with hidden gluten. It’s rarely the obvious stuff. It’s the flour in your scrambled eggs, the wheat starch binding your vitamins, the barley malt in your breakfast cereal. By the time the celiac community has catalogued a source, dozens of people have already had a reaction to it.

This is that catalogue.

Table of contents

Quick Reference: Is It Gluten Free?

If you’re here for a fast answer, start here. Everything in the table gets a full explanation below.

The Ones That Catch People Every Single Time

Soy sauce

The most cited. Standard soy sauce is fermented with wheat — it’s not incidental, it’s part of the traditional process. At restaurants, assume all soy sauce contains gluten unless they specifically use tamari or a labeled GF version.

The swap: Tamari works as a 1:1 substitute, but read the label — some tamari brands add wheat or barley. If it’s not labeled gluten free, it’s not safe to assume. Coconut aminos are another option and naturally GF; some people find them slightly sweeter.

In some countries (Canada, for example), GF soy sauce is actually easier to find and cheaper than you’d expect. Worth checking local brands rather than defaulting to expensive tamari.

Oats

Regular oats are grown and processed alongside wheat. Cross-contamination is the norm, not the exception. Even if oats are naturally gluten free, almost everything in the supply chain touches wheat.

Certified GF oats (like Bob’s Red Mill) solve the contamination problem — but there’s a separate issue. All oats contain avenin, a protein structurally similar to gluten. A meaningful percentage of celiacs react to avenin even in pure GF oats. So “certified GF oats” is safe for many, but not a universal solution.

“Regular oats are prone to cross-contamination, but some celiacs react to GF oats as well, as all oats contain avenin, a protein with similar structure to gluten. Some of us have immune systems that can’t tell the difference.”

If you’re newly diagnosed, it’s generally recommended to avoid oats entirely for the first 6–12 months, then reintroduce certified GF oats and monitor your reaction.

Malt vinegar

Barley-derived. Any time you see “malt” without further specification in an ingredient list, assume barley. In the US, “malt” in an ingredient list legally means barley malt. Full stop. Apple cider vinegar and wine vinegars are safe substitutes — the fermentation process removes the gluten-containing proteins.

Imitation crab

This one surprises people because it’s seafood-adjacent. Imitation crab (surimi) is made from processed white fish — and wheat starch is used as a binder. Most imitation crab contains gluten. That said, GF versions exist: TransOcean Simply Surimi is one, and some Walmart store brands are labeled GF. Assume it contains gluten at restaurants and in sushi.

Grains People Get Backwards in Both Directions

Some of the most-searched food questions we see aren’t about sauces or additives — they’re about whole grains people either wrongly trust or wrongly fear. Here’s where each one actually lands.

Sourdough bread

The claim shows up constantly on social media: fermentation “breaks down” the gluten, so sourdough is supposedly safe for celiac disease. It isn’t. Even aggressive sourdough fermentation reduces gluten by roughly 70–80%, according to Beyond Celiac — but that still leaves the loaf hundreds of times over the 20 ppm threshold that legally defines “gluten free” in the US. A 2011 clinical study did get sourdough below 20 ppm, but only using specific lab-selected lactobacillus strains fermented for 60 days — nothing like the sourdough at your bakery or the one you’d bake at home. If you don’t react to a slice, that doesn’t mean nothing happened; villi damage can occur without symptoms. The only sourdough that’s actually safe is one made from GF flour from the start and labeled accordingly.

Semolina and farro

Both get a health-food glow-up that has nothing to do with being gluten free. Semolina is milled from durum wheat — it’s the flour in most dried pasta and a lot of “artisan” bread. Farro is an ancient wheat species, not a modern hybrid, but ancient still means wheat. Neither is safe, regardless of how a restaurant menu markets them.

Pearl barley

Barley is one of the three gluten grains (wheat, barley, rye), and pearl barley is just barley with the outer hull removed — the gluten is still there. It shows up in soups and stews (bean and barley soup being the classic trap) far more often than people expect from something that looks and cooks like a grain, not “bread.”

Millet flour

The opposite problem: millet sounds like it belongs on the same shelf as farro and semolina, but it’s naturally gluten free and shows up constantly in GF flour blends. If a recipe or product lists millet flour and nothing else concerning, it’s not the ingredient to worry about.

Rice — plain, arborio, and risotto

Plain rice, including arborio (the short-grain rice used for risotto), is naturally gluten free. Where people get caught: fried rice (soy sauce, covered above), seasoned rice mixes (flavor packets can use wheat-based flavoring or anti-caking agents), and restaurant risotto. The dish itself — arborio, broth, butter, cheese — is safe by ingredients, but Beyond Celiac notes that many store-bought stock cubes and restaurant broths use wheat-based thickeners or malt extract, and some kitchens finish risotto with a flour-based roux for extra creaminess. Ask what stock they use before assuming the rice base makes it automatically safe.

Wheatgrass

Technically gluten free when harvested young — wheatgrass is cut before the wheat plant grows a seed head, and gluten only develops in the grain, not the grass. The Gluten Intolerance Group still recommends looking for a certified GF product rather than assuming any wheatgrass shot is safe, since harvest timing and cross-contact with seed hulls aren’t something you can verify by looking at a smoothie.

The “Sounds Like Gluten, Isn’t” Additive List

This is the flip side of malt vinegar and imitation crab: names that sound alarming to anyone who’s learned to fear “wheat-derived” ingredients, but that food chemistry actually clears.

Maltodextrin

The word “malt” scares people for good reason — malt vinegar and malted barley both contain gluten. Maltodextrin is different. In the US, it’s most commonly made from corn, and even when it’s wheat-derived, the National Celiac Association and GIG confirm the processing strips out the gluten protein, landing it under the FDA’s 20 ppm gluten-free threshold. If FALCPA requires a “Contains: wheat” allergen statement (for wheat-allergic people, a separate issue from celiac), it’ll say so — but that label doesn’t mean it’s unsafe for gluten.

Dextrose

Same logic, same verdict: safe. Dextrose is a highly refined sugar, and regardless of whether it started as corn (most common in the US), wheat, or another starch, the refining process removes the proteins that trigger a celiac reaction.

MSG (monosodium glutamate)

MSG gets confused with gluten purely because the words sound alike — glutamate and gluten aren’t related. There’s a real historical reason for the confusion, though: early 20th-century MSG production actually did start from wheat gluten, since it’s rich in glutamic acid. That stopped in the 1960s; modern MSG is fermented from corn starch, sugar cane, or sugar beets, never touching a gluten grain. It’s considered safe on a gluten-free diet.

Yeast extract — the exception

This is the one that doesn’t get the free pass. Autolyzed yeast extract can be grown on a barley-based medium, and manufacturers aren’t required to disclose the source on the label. The Gluten Intolerance Group’s guidance is to only trust yeast extract that’s specifically labeled gluten free or third-party certified (GFCO) — not to assume it’s fine just because yeast itself is a fungus, not a grain.

The “Wait, What?” Category

These are the ones the community talks about because nobody thinks to warn you.

Hotel scrambled eggs

Already mentioned, but worth repeating because it’s so universal: hotel buffet scrambled eggs are almost always baked (not cooked on a stovetop) and typically contain flour to give them their texture. This isn’t a regional thing or a cheap-hotel thing — it’s standard food service practice.

The same applies to many diner-style scrambled eggs. The IHOP situation is well-documented: their omelets include pancake batter in the mix, and the manager isn’t going to override it even if you ask.

What you can do at sit-down restaurants: ask them to cook your eggs in a clean pan with no additives. Many will, though cross-contamination on shared grills is still a risk.

Vitamins and medications

One community member nearly gave Flintstones vitamins to their celiac spouse. The wheat is right on the label — it just doesn’t register because vitamins aren’t food, conceptually. Wheat starch is used as a binder in a wide range of tablets, capsules, and chewables.

Check every supplement and medication. GF versions often exist — the Walmart Great Value version of Flintstones vitamins is reportedly GF. For medications, your pharmacist can usually tell you and flag alternatives.

Mentos gum

Yes, the gum. Mentos gum contains wheat. Mentos candy (the rolls) do too. This one is unexpected because chewing gum doesn’t feel like a food product that would contain flour.

Rice Krispies (and most name-brand cereals)

Kellogg’s Rice Krispies use malt flavoring derived from barley. They’re not gluten free, despite being literally rice. Off-brand rice puff cereals — Safeway, Kroger store brands — are often actually GF; check the label. Same goes for cornflakes: name-brand versions often contain malt syrup.

Shampoo and body wash

This is genuinely debated in the celiac community, but enough people have had skin reactions (dermatitis herpetiformis, hives) from wheat-containing body products that it’s worth knowing. Shower products get in your mouth more than you’d think. If you’re reacting and can’t find a dietary source, check your shampoo and body wash.

Aveeno products specifically have come up repeatedly in this context.

Play-Doh

If you have kids. It’s wheat-based. Wash hands after, or use a GF alternative.

Restaurant Landmines Specifically

Eating out with celiac is its own skill set. A few traps the community has documented:

Mashed potatoes with filler. Restaurants sometimes add wheat flour to stretch their mashed potato prep. Not labeled, not disclosed. Asking “are the mashed potatoes gluten free?” may get you a confident “yes” from someone who has no idea.

Seasoned or flavored fries. Plain fries in a dedicated fryer are often safe. Seasoned fries — Cajun, garlic, “signature” — frequently use seasoning blends that contain wheat flour as a carrier. Always verify what’s in the seasoning, not just the fries themselves.

“Corn” tortilla chips. Some tortilla chips labeled or described as corn can be cross-contaminated with flour at the supplier level — especially restaurant chips that come from a large food service distributor. Reactions to “definitely corn” chips are documented enough in the community that it’s worth asking where they source them.

Chorizo and other processed sausages. Traditional chorizo is just pork, fat, and spices — naturally GF. The risk is commercial versions that use wheat flour or modified food starch as a binder to cut cost and improve texture, plus casings and shared-facility cross-contamination. Treat any pre-packaged or restaurant chorizo as unverified until the label or the kitchen confirms it.

The label says “gluten free” but the facility doesn’t. This is the one that creates the most false confidence. A product can carry a GF label based solely on its ingredient list without any certification about its production facility. Look for “produced in a dedicated gluten free facility” or a third-party certification (GFFS, NSF) if you’re highly sensitive. “Wheat-free” and “gluten free” are also not the same thing.

Some Safer Swaps Worth Knowing

Not everything on this list is doom — the community has found reliable alternatives for most of them.

• Soy sauce: San-J or La Choy tamari (both GF-labeled); Coconut aminos
• BBQ sauce: Sweet Baby Ray’s at Aldi (GF); verify per brand
• Cream of mushroom soup: Campbell’s now makes GF versions; Progresso also has one
• Oats: Bob’s Red Mill certified GF oats (if you tolerate avenin)
• Imitation crab: TransOcean Simply Surimi
• Beer: Ciders labeled GF; Glutenberg; Omission (debate exists on this one)
• Rice cereal: Safeway/Kroger store brands often GF; Nature’s Path in Canada
• Sourdough: bread labeled GF and made with GF flour from the start — not “traditional sourdough process”
• Yeast extract / Marmite-style spreads: look for a GFCO-certified or GF-labeled version
• Risotto stock: certified GF broth or bouillon instead of a generic cube

The Honest Problem With Checking Everything

Reading every label every time sounds simple in theory. In practice, it’s exhausting — especially when you’re traveling, at someone else’s house, or standing in an unfamiliar grocery store in front of 40 product options.

The pattern the community keeps describing is this: you know the rules, but gluten hides in the unexpected place, the one time you didn’t check.

That’s exactly what we built GF Gluten Scanner for. You point the camera at an ingredient list, a label, or even a dish at a restaurant, and it tells you whether it’s safe — in seconds, without you having to know every alias for barley malt or every jurisdiction where “malt” means something different.

It also keeps a history of everything you’ve scanned, so when you find a product that works, you don’t have to check it again next week.

Download GF Gluten Scanner on the App Store →

One More Thing: “Is It Gluten Free?” Is Sometimes the Wrong Question

A note from the community that stuck with me:

“The biggest things that sneak up are products labeled ‘gluten-free’ or ‘wheat-free’, or inappropriately shelved next to GF items in health food aisles — even in places with strict labelling laws, seeing ‘gluten-free’ on the front of a package can falsely comfort someone into thinking the item is produced in GF facilities. Make sure you’re checking for facility disclaimers, not just labelling or ingredients.”

The question isn’t just “does this contain gluten?” It’s “was this made somewhere that guarantees it wasn’t contaminated?” Those are two different certifications, and only highly sensitive celiacs need to obsess over the second one — but it’s worth knowing the distinction exists.

Start with the ingredient list. Then check for “may contain wheat” or shared facility warnings. Then, if you’ve been reacting to something you can’t identify, go back and look at supplements, personal care products, and the things you’d never think to check.

The list above is a starting point, not a ceiling. Gluten shows up in places the community is still finding. When in doubt — scan it.