Celiac and gluten: the ingredients that catch people out

Wheat must be declared in bold on any European label, so the obvious sources are easy. The difficulty is barley in things that do not taste of barley, and the long tail of ingredients whose name gives nothing away.

Barley is the one that catches people

Barley is a gluten grain, and malt is made from barley. Malt extract, malted barley flour, malt vinegar and malt flavouring all carry gluten, and they appear in breakfast cereals, biscuits, chocolate confectionery, stocks and sauces, usually in small print and often in products that read as obviously safe.

Beer is malted barley and is not gluten free unless it says so explicitly. Brewing does not remove gluten, and gluten-removed beers are a separate category whose suitability for celiac disease is still contested.

Sauces, stocks and anything thickened

Conventionally brewed soy sauce is made with roughly equal parts wheat and soybean, which surprises people who assume soy sauce is a soy product. Tamari is the wheat-free style, though not every tamari is wheat free, so the label still needs reading. Miso is often made with barley or wheat, and hoisin and oyster sauce are usually thickened with wheat.

Hydrolysed vegetable protein, a savoury flavouring in stocks and crisps, may be made from wheat. Modified starch may be wheat starch, though in the European Union the source must be declared where it is an allergen. Dextrin is a further case that depends on its source.

Oats are a separate question

Oats do not contain gluten in the way wheat, barley and rye do. They contain avenin, which most people with celiac disease tolerate. The practical problem is contamination: oats are commonly grown in rotation with wheat and milled on shared equipment, so ordinary oats routinely carry wheat gluten. This is why certified gluten-free oats exist as a distinct product.

A minority of people with celiac disease react to avenin itself, so oats are usually introduced cautiously and under advice rather than assumed safe because a packet says gluten free.

What the labelling rules do and do not cover

In the European Union and the United Kingdom, cereals containing gluten are among the fourteen allergens that must be emphasised in the ingredients list, typically in bold. That is a real protection and it covers wheat, rye, barley, oats, spelt and kamut wherever they appear as ingredients.

What it does not cover is cross-contamination, which is voluntary. May contain wheat and produced in a facility that handles wheat are unregulated phrases, and their absence is not a guarantee. The gluten free claim is the regulated one: it requires the product to test below 20 parts per million.

Names worth knowing

Ingredients worth recognising on sight, with the other names each one appears under. Wheat in particular is sold under a long list of names, and several of them do not contain the word.

Wheat

Whole Grain WheatDurum WheatWheat BerriesWheat BranWheat GermSpeltKamut

Wheat Flour

FlourWhole Wheat FlourWholemeal FlourEnriched Wheat Flour

Wheat Gluten

SeitanVital Wheat GlutenWheat ProteinGluten Flour

Semolina

Durum WheatDurum Semolina

Spelt

Dinkel

Barley

Pearled BarleyBarley FlourBarley Flakes

Barley Malt

MaltMalt ExtractBarley Malt ExtractMalted Barley

Rye

Rye FlourRye MealRye Flakes

Oat

Rolled OatsOatmealOat FlourOat BranOat Fiber

Beer

LagerAle

Soy Sauce

Soya SauceShoyu

Miso

Miso PasteShiro MisoAka Miso

Hydrolysed Vegetable Protein

HVPHydrolyzed Vegetable ProteinHydrolysed Soy ProteinTextured Vegetable Protein

Masa Harina

MasaMasarepaNixtamalized Corn FlourMaseca

A selection, not the full list.

Check a whole label at once

Recognising these by eye is the hard way to do it. Photograph the ingredients panel and NoshWise reads every line against this profile, names what to avoid, and says why.

Scan a label

Common questions

Is soy sauce gluten free?

Usually not. Conventionally brewed soy sauce is made with roughly equal parts wheat and soybean. Tamari is the traditionally wheat-free style, but not every tamari is wheat free, so the label still needs checking.

Is malt gluten free?

No. Malt is made from barley, which is a gluten grain. Malt extract, malted barley flour, malt vinegar and malt flavouring all carry gluten, including in products that otherwise seem unrelated to barley.

Are oats gluten free?

Oats do not contain wheat gluten, but ordinary oats are routinely contaminated with it through shared growing and milling. Certified gluten-free oats avoid that. A minority of people with celiac disease also react to avenin, the protein in oats itself.

Does may contain wheat mean a product is unsafe?

It is a voluntary statement about cross-contamination risk, not a regulated one, and manufacturers apply it inconsistently. Its absence is not a guarantee of anything. The regulated claim is gluten free, which requires testing below 20 parts per million.

Is modified starch gluten free?

It depends on the starch it was made from, which is often maize or potato but can be wheat. In the European Union, where the source is a declarable allergen it must be stated, so a label reading modified wheat starch tells you, and one reading only modified starch generally indicates a non-allergen source.