Hidden Gluten

After diagnosis, the obvious sources of gluten are easy to remove. Bread, pasta, pizza, beer — these are expected. The harder part is the gluten that doesn’t announce itself: the wheat in your soy sauce, the barley in your malt vinegar, the rye in your rye whiskey, the wheat starch in your stock cubes.

Where Gluten Hides

Hidden gluten shows up in foods that most people would never think to question. This isn’t an exhaustive list, but it covers the sources that catch newly diagnosed coeliacs most often.

Soy sauce. Traditional soy sauce is brewed with wheat. It’s not a trace — wheat is a primary ingredient. Tamari is a Japanese soy sauce traditionally made without wheat; check the label, as formulations vary by brand.

Malt vinegar. Made from barley. Regular malt vinegar is not gluten-free. Distilled vinegars (white wine, cider, spirit) are generally lower-risk; malt is not.

Stock cubes and ready-made stocks. Many contain wheat flour or barley derivatives. Read every label. GF stock cubes exist and are easy to find.

Sauces and condiments. Worcestershire sauce, soy-based marinades, some mustards, many ketchups and brown sauces, salad dressings, and stir-fry sauces can all contain gluten. Some are fine; some aren’t. Labels are essential.

Medications and supplements. Wheat starch is used as a filler or binder in some tablets and capsules. It’s worth checking with a pharmacist when a new medication is prescribed, especially for long-term prescriptions.

Communion wafers. Traditional Catholic communion hosts are made from wheat. Gluten-free alternatives exist in many churches — ask in advance.

Processed meats. Sausages, deli meats, meat pies, and some ready meals use wheat-based fillers. Fresh unprocessed meat is always fine; processed versions need scrutiny.

Flavoured crisps and snacks. Plain potato crisps are generally low-risk. Flavoured varieties often use wheat-derived flavour coatings or are made on shared lines.

Beer, ale, and lager. Brewed from barley and/or wheat. Standard beers are not gluten-free. Certified GF beers exist, brewed from alternative grains, as do some distilled spirits that are generally lower-risk.

What This Means for You

In the first months after diagnosis, reading every label on every processed product is the only reliable approach. Over time you’ll build a trusted repertoire and the process becomes faster. When in doubt — look it up, or leave it out.

Related in the Coeliac Alphabet: Food Labels · Yeast Extract · Label Reading FAQ · back to the full A–Z.