After a celiac diagnosis in our house, I thought I had gluten figured out: bread, pasta, crackers, baked goods. I was wrong. Manufacturers use wheat flour, barley malt, and rye as thickeners, binders, and flavor carriers in many processed foods. In celiac disease, gluten triggers an immune response that damages the small intestine. The response is not proportional to the amount of gluten, so a food does not need to look like bread to be a problem.

The short answer

The foods that surprised me most are soy sauce, malt vinegar, bouillon cubes, seasoning packets, licorice, imitation crab, some deli meats, beer, and oats that are not labeled gluten-free. A product can say wheat-free and still contain barley or rye, so wheat-free is not the same as gluten-free. In the U.S., the FDA requires packaged foods labeled gluten-free to contain less than 20 parts per million of gluten. That regulatory threshold is the first thing I check when I pick up a box or a jar. The front label does not replace reading the ingredient list because barley and rye are not required to be listed as major allergens.

Sauces, condiments, and marinades

Soy sauce is the biggest surprise for most people. Traditional soy sauce is brewed with wheat, so a stir-fry or marinade can become a gluten source even when the rest of the ingredients are simple. I use tamari that is labeled gluten-free or a soy sauce with a gluten-free label. Teriyaki and hoisin sauces usually build on soy sauce, and many barbecue sauces and salad dressings use wheat-based thickeners or malt vinegar. Malt vinegar comes from barley and is not gluten-free. Worcestershire sauce needs a label check because some versions contain malt vinegar or soy sauce.

Soups, broths, bouillon, and seasoning packets

This category caught me off guard. Canned soups and cream-based soup mixes often use wheat flour as a thickener. Bouillon cubes can include wheat or barley ingredients, and seasoning packets for tacos, ranch, chili, and ramen use wheat flour as an anti-caking agent or body builder in some formulations. I started keeping a few pantry items that are clearly labeled gluten-free. Clean Monday Meals Chicken Bouillon is one I use because it is gluten-free, dairy-free, soy-free, and made with a short ingredient list. The brand also makes taco, ranch, onion soup, and ramen seasonings that are labeled gluten-free. For packaged soup bases, I read the full ingredient list rather than relying on the front of the package.

Sweets and snacks

Licorice was the one that shocked me. Many black and red licorice candies use wheat flour as a binder. Some chocolate bars and candy pieces contain barley malt or wafer bits. Ice cream with cookie dough, brownie chunks, or cake pieces can contain wheat. Granola bars and some cereals use barley malt extract or malt flavoring even when they look oat-based. If a cereal box does not say gluten-free, I read the ingredient list for the word malt.

Meat, poultry, and plant-based alternatives

Deli turkey, ham, and chicken can be seasoned or injected with broths that contain wheat. Sausages and hot dogs sometimes use wheat-based fillers or soy sauce in the seasoning blend. Imitation crab, often labeled surimi, usually contains wheat starch. Seitan is made from wheat gluten and is not gluten-free. Plant-based burgers and meat alternatives often use wheat gluten as their protein base, so I check the label even when the package focuses on vegetables.

Beverages

Beer, ale, lager, and malt beverages are made from barley and are not gluten-free. Some companies make gluten-removed beer, but the testing methods do not give me enough confidence, so I skip it. Celiac disease organizations consider distilled spirits made from wheat, barley, or rye generally gluten-free because distillation removes the gluten protein. Manufacturers sometimes add ingredients to flavored spirits after distillation, so I check the label. Drink mixes and some coffee drinks can also contain malt or wheat-based flavorings.

Oats and other surprising grains

Oats themselves do not contain gluten. Farmers and processors frequently grow, transport, or mill oats alongside wheat, which is why celiac organizations recommend choosing only oats labeled gluten-free. I also learned that farro, spelt, kamut, einkorn, semolina, couscous, bulgur, and triticale are forms of wheat or wheat-rye hybrids and are not gluten-free. Buckwheat is gluten-free despite the name, but cross-contact means I still look for a gluten-free label.

Label reading terms that matter

These are the words I keep on a note in my phone:

• Wheat, barley, rye, malt, malt extract, malt flavoring, malt syrup, malt vinegar
• Hydrolyzed wheat protein
• Brewer's yeast, when it comes from beer, can contain gluten
• Oats, only if labeled gluten-free
• Wheat starch, only when the finished product is labeled gluten-free

How I shop now

I start with whole foods that do not need a label: fruits, vegetables, rice, potatoes, beans, plain meat, fish, and eggs. Read every label. Then I add packaged items only when they have a gluten-free label or an ingredient list I can verify. For bouillon, soup bases, and seasonings, I look for blends that list real ingredients and are clearly labeled gluten-free. Clean Monday Meals has been useful for that because the seasonings, bouillons, and ramen noodles are all gluten-free. The company makes the Clean Ramen Noodles with organic brown rice flour in an allergen-free facility, and the seasonings have a short ingredient list.