Foods that secretly contain gluten
Gluten is only in wheat, barley and rye, so whole foods are mostly safe. The catch is processed food, where wheat turns up as a thickener, coating or flavouring. Here is what to watch.
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| Ingredient or food | Verdict | Why |
|---|---|---|
| Wheat, barley, rye | Contains gluten | The three grains that contain gluten |
| Seitan | Contains gluten | It is essentially pure wheat gluten |
| Soy sauce | Contains gluten | Brewed with wheat; use tamari (check it says gluten free) or coconut aminos |
| Beer (standard) | Contains gluten | Made from barley; look for gluten-free beer |
| Malt vinegar | Contains gluten | Malt comes from barley |
| Couscous | Contains gluten | Made from wheat semolina |
| Most breaded or battered food | Contains gluten | Coating is usually wheat flour |
| Oats | Check the label | Naturally gluten-free but often cross-contaminated; buy certified |
| Soups, gravies, sauces | Check the label | Often thickened with wheat flour |
| Processed and deli meats | Check the label | May use wheat as a binder or filler |
| Liquorice | Check the label | Usually contains wheat flour |
| Some chips and seasonings | Check the label | Flavourings can contain wheat |
| Chocolate and sweets | Check the label | Mostly fine, but check for barley malt or biscuit |
| Rice, corn, potatoes | Gluten free | Naturally gluten-free staples |
| Quinoa, buckwheat, millet | Gluten free | Gluten-free grains and seeds |
| Plain meat, fish, eggs | Gluten free | No gluten unless breaded or marinated |
| Fruit, vegetables, legumes | Gluten free | Naturally gluten-free |
| Plain dairy | Gluten free | Milk, cheese and yogurt are gluten-free |
| Potato Chips | Check the label | Check flavourings; plain/ready-salted are the safe bet |
| Rice | Gluten free | Great staple, watch only flavoured rice mixes |
| Wheat Flour | Contains gluten | Use gluten-free flour blends, rice, almond or buckwheat flour |
| Corn | Gluten free | Corn tortillas and polenta are handy GF swaps |
| Chocolate | Check the label | Plain dark/milk chocolate is typically safe; check inclusions |
| Chips / Fries | Check the label | Ask about batter and shared fryers when eating out |
| Quinoa | Gluten free | A great high-protein GF grain alternative |
| Sausages | Check the label | Look for sausages labelled gluten free |
| Blue Cheese | Gluten free | Generally safe, check for any added ingredients |
| Ice Cream | Check the label | Check for biscuit pieces, malt and shared equipment |
| Buckwheat | Gluten free | Good for GF pancakes and noodles (check soba is 100% buckwheat) |
| Milk, Butter and Yoghurt | Gluten free | The additions are the risk, not the dairy: malted milk drinks, cereal toppings, biscuit pieces |
| Spelt | Contains gluten | Buckwheat, millet, sorghum and teff are genuine alternatives |
| Cornflakes | Contains gluten | Look for cornflakes certified gluten free |
| Barley | Contains gluten | Watch for malt, malt extract, malt vinegar and brewer's yeast on labels |
| Rye | Contains gluten | Gluten free crispbreads are usually rice or buckwheat based |
| Bulgur | Contains gluten | Quinoa or millet works in tabbouleh and pilafs and takes dressing the same way |
| Semolina | Contains gluten | Rice, corn or legume pasta |
| Breadcrumbs | Contains gluten | Crushed cornflakes work only if the flakes are certified, given the malt |
| Udon Noodles | Contains gluten | Rice noodles, or soba labelled 100 per cent buckwheat |
| Tempura | Contains gluten | Even a gluten free batter is unsafe from a shared fryer |
| Imitation Crab | Contains gluten | Real crab or prawns |
| Potatoes | Gluten free | Only what is done to them is a risk: batter, shared fryers, and some processed potato products |
| Eggs | Gluten free | Watch what they are cooked with rather than the egg |
| Popcorn | Gluten free | Flavoured and cinema popcorn is the risk, particularly anything with malt or a seasoning blend |
| Polenta | Gluten free | A good semolina substitute |
| Rice Noodles | Gluten free | Read the packet anyway |
| Spirits | Gluten free | The risk is anything added AFTER distilling |
| Lentils and Beans | Gluten free | Buy packaged rather than from bulk bins, where a shared scoop is the real risk |
| Stock Cubes | Check the label | Gluten free stock is widely sold and labelled |
| Gravy | Check the label | Thicken with cornflour or arrowroot, or buy gravy labelled gluten free |
| Sushi | Check the label | Bring tamari, skip the crab sticks and anything crunchy |
| Miso | Check the label | Look for miso naming rice koji, or one labelled gluten free |
| Baking Powder | Check the label | Check the packet once and then stick with that brand |
Naturally gluten-free vs certified gluten-free
Many foods have no gluten ingredients but are made in kitchens or factories that also handle wheat. For a mild sensitivity that is often fine; for coeliac disease, look for certified gluten-free, which is tested to a safe threshold.
Frequently asked questions
What foods secretly contain gluten?
The surprising sources are soy sauce (brewed with wheat), beer (barley), malt vinegar (barley), and thickened soups, gravies and sauces that use wheat flour. Processed meats, some chips, and liquorice can hide it too, so labels matter.
Are oats gluten-free?
Oats are naturally free of gluten, but they are very often grown and milled alongside wheat, so standard oats can be cross-contaminated. Look for oats labelled certified gluten-free if you have coeliac disease.
What can I eat that is naturally gluten-free?
Plenty: rice, corn, potatoes, quinoa and buckwheat, all plain meat, fish and eggs, all fruit, vegetables and legumes, and plain dairy. Gluten is only in wheat, barley and rye, so whole unprocessed foods are usually safe.
Does gluten-free mean the same as coeliac-safe?
For a certified gluten-free product, yes, it is tested below the safe threshold. But 'no gluten ingredients' is not the same as certified: cross-contamination in a shared kitchen or factory can still be a risk for someone with coeliac disease.