The quick answer
Gluten-free means a food meets the applicable standard for gluten content. In the UK, this means no more than 20 parts per million (ppm) of gluten.
Wheat-free means the product is represented as being free from wheat. It does not automatically mean the product is free from gluten from barley or rye.
Here's the important distinction:
Gluten-free
Can contain specially processed wheat-derived ingredients, such as gluten-free wheat starch. UK limit: no more than 20 ppm gluten.
Wheat-free
Can still contain gluten from barley or rye. Not equivalent to gluten-free.
| Question | Gluten-free | Wheat-free |
|---|---|---|
| Main concern | Gluten content | Wheat |
| Can contain barley or rye gluten? | Must meet the gluten-free threshold | Potentially, yes |
| Can contain specially processed wheat starch? | Yes, in certain products | A wheat-derived ingredient requires careful scrutiny of the claim |
| Relevant to coeliac disease? | Yes | Not sufficient by itself |
| Relevant to wheat allergy? | Not sufficient by itself | Relevant, but individual suitability still needs checking |
| Has a specific UK numerical threshold? | Yes, 20 ppm | No equivalent universal 20 ppm definition |
| Guarantees absence of every allergen? | No | No |
The correct label to look for depends on the person's condition and the actual product.
1. What does gluten-free mean?
Gluten is the name commonly used for a group of proteins found in certain cereals.
The most important gluten-containing cereals for people with coeliac disease are:
- Wheat
- Barley
- Rye
Wheat varieties such as spelt, durum, emmer, einkorn and Khorasan wheat also contain gluten.
What does gluten-free mean under UK rules?
In the UK, a food labelled gluten-free must contain no more than 20 milligrams of gluten per kilogram of food.
This is equivalent to 20 parts per million.
The threshold is a legal standard, not a promise that absolutely no gluten molecules are present.
Why isn't the limit zero?
Measuring and controlling tiny amounts of gluten in food involves practical analytical limits.
The 20 ppm standard provides a regulated threshold used for gluten-free foods.
It should not be confused with a guarantee of zero gluten.
Is gluten-free food suitable for coeliac disease?
Foods that meet the applicable gluten-free standard are generally appropriate for a gluten-free diet, subject to individual dietary guidance and any other relevant ingredients.
Some people with coeliac disease also have additional dietary needs or allergies.
Does gluten-free mean free from other allergens?
No.
Gluten-free foods can contain:
- Milk
- Eggs
- Soy
- Peanuts
- Tree nuts
- Sesame
- Fish
- Other allergens
A gluten-free cake, for example, may contain almond flour and eggs.
Always check the full ingredients list.
2. What does wheat-free mean?
Wheat-free describes a product represented as being free from wheat.
This can be important for people with wheat allergy.
However, wheat-free does not automatically mean gluten-free.
Why not?
Because wheat isn't the only cereal containing gluten.
Barley and rye also contain gluten.
A food can contain no wheat but still contain barley or rye.
Example: wheat-free rye bread
Imagine a loaf made with:
Wheat-free rye bread
Ingredients: Rye flour, water, yeast, salt.
There is no wheat in the recipe.
But rye contains gluten.
This bread would not be suitable for someone who needs a strict gluten-free diet.
Example: barley-based breakfast cereal
Barley breakfast cereal
Ingredients: Barley flakes, rice, sugar, salt.
Again, no wheat is deliberately included.
However, barley contains gluten.
Someone with coeliac disease should not assume the cereal is suitable simply because it is wheat-free.
3. Can gluten-free food contain wheat?
Yes.
This is probably the most surprising part of the distinction.
Some gluten-free products contain specially processed wheat-derived ingredients.
The best-known example is gluten-free wheat starch.
What is wheat starch?
Wheat starch is the starch component extracted from wheat.
Ordinary wheat starch may contain residual gluten.
However, wheat starch can be processed to reduce gluten content.
What is gluten-free wheat starch?
Gluten-free wheat starch is specially processed wheat starch used in products designed to meet the applicable gluten-free standard.
It may appear in:
- Gluten-free bread
- Gluten-free rolls
- Certain bakery products
- Some specialist flour blends
Why would manufacturers use wheat starch in gluten-free bread?
Starch can contribute to texture, structure and softness.
Manufacturers may use specially processed wheat starch to achieve particular baking properties.
Is gluten-free wheat starch suitable for coeliac disease?
Specially processed wheat starch can be suitable for people with coeliac disease when the final food meets applicable gluten-free requirements.
Coeliac UK provides information about gluten-free wheat starch and its use in gluten-free foods.
Is gluten-free wheat starch suitable for wheat allergy?
Not automatically.
Removing gluten to a regulated threshold does not necessarily remove every wheat protein relevant to a wheat allergy.
Someone with wheat allergy should not assume a gluten-free product containing wheat-derived starch is suitable.
Follow individual allergy guidance.
4. Why can a product say gluten-free and still declare wheat?
UK food labelling rules address both gluten-free claims and regulated allergen declarations.
These are related but distinct requirements.
A product may use a wheat-derived ingredient that meets the relevant conditions for gluten-free use while still needing to identify wheat under applicable allergen information rules.
Example label
Gluten-free white bread
Ingredients: Gluten-free wheat starch (wheat), water, vegetable oil, yeast, sugar, salt.
The gluten-free claim concerns the product's gluten content.
The wheat declaration identifies the ingredient's source.
These statements are not necessarily contradictory.
What should you do?
For coeliac disease, consider the gluten-free claim and relevant product information.
For wheat allergy, consider the wheat-derived ingredient and the individual's medical advice.
Do not treat a gluten-free claim as proof that a food contains no wheat-derived material.
5. Which grains contain gluten?
Knowing the common grains makes food labels easier to understand.
| Grain | Contains gluten naturally? | Notes |
|---|---|---|
| Wheat | Yes | Includes several varieties |
| Barley | Yes | Often used in malt |
| Rye | Yes | Used in bread and crispbread |
| Spelt | Yes | A type of wheat |
| Durum | Yes | Common in pasta |
| Einkorn | Yes | Ancient wheat variety |
| Emmer | Yes | Ancient wheat variety |
| Khorasan wheat | Yes | Sometimes marketed under a brand name |
| Rice | No | Naturally gluten-free |
| Maize/corn | No | Naturally gluten-free |
| Quinoa | No | Naturally gluten-free |
| Buckwheat | No | Despite the name, not wheat |
| Millet | No | Naturally gluten-free |
| Sorghum | No | Naturally gluten-free |
| Oats | Special consideration | Contamination and avenin matter |
A naturally gluten-free grain can still be used in a product containing gluten or be affected by cross-contact.
Always check the final food.
6. Are oats gluten-free or wheat-free?
Oats are particularly confusing because they are a separate cereal but can be contaminated with gluten-containing grains.
Are oats wheat?
No.
Oats are not wheat.
Do oats naturally contain wheat gluten?
No.
However, ordinary oats may become contaminated with wheat, barley or rye during growing, harvesting, transport or processing.
What are gluten-free oats?
Gluten-free oats are produced and controlled to meet the applicable gluten-free standard.
What is avenin?
Avenin is a protein naturally found in oats.
Some people with coeliac disease may react to avenin even when the oats are gluten-free.
Can someone with coeliac disease eat oats?
Many people with coeliac disease can eat suitable gluten-free oats, but individual advice matters.
Is oat milk gluten-free?
Not automatically.
Some oat drinks are labelled gluten-free.
Others are not.
Check the actual product and its gluten-free claim.
7. Does barley malt contain gluten?
Barley contains gluten.
Barley malt ingredients can therefore be important for people with coeliac disease.
Where is barley malt used?
Examples include:
- Breakfast cereals
- Malted drinks
- Biscuits
- Chocolate products
- Sauces
- Confectionery
- Flavourings
What about barley malt extract?
Barley malt extract is derived from barley.
Its relevance to a gluten-free diet depends on the product, processing and final gluten content.
Some foods containing barley-derived ingredients may meet gluten-free requirements.
Others do not.
Can you assume a product is gluten-free if barley malt appears near the end of the ingredients?
No.
Ingredient order does not establish whether the final product meets the gluten-free threshold.
Look for appropriate gluten-free information and reliable product-specific guidance. Our guide does malt contain gluten? covers each malt ingredient in detail.
8. Is malt vinegar gluten-free?
Malt vinegar is traditionally produced from malted barley.
Processing can affect gluten content, and the suitability of particular products depends on the manufacturing process and product information.
For people with coeliac disease, follow reliable guidance from Coeliac UK and check the specific product. Coeliac UK currently lists barley malt vinegar under ingredients you need to check.
Do not assume that all vinegars are identical.
Wine vinegar, cider vinegar and malt vinegar have different starting ingredients.
9. Is soy sauce gluten-free?
Traditional soy sauce often contains wheat.
A typical ingredients list might read:
Soy sauce
Ingredients: Water, soybeans, wheat, salt.
What about tamari?
Some tamari products are made without wheat.
However, not every tamari product is gluten-free.
What about gluten-free soy sauce?
Some products are specifically formulated and labelled gluten-free.
For coeliac disease, the gluten-free claim is relevant.
For wheat allergy, check whether the product contains any wheat-derived ingredients and follow individual guidance.
10. Is buckwheat gluten-free?
Yes, buckwheat is naturally gluten-free.
Despite its name, buckwheat is not a variety of wheat.
It is used in foods such as:
- Buckwheat flour
- Pancakes
- Noodles
- Porridge
- Breakfast products
Are all buckwheat noodles gluten-free?
No.
Some soba noodles contain a mixture of buckwheat flour and wheat flour.
A product described as buckwheat noodles may still contain wheat.
Check the ingredients list.
11. Is semolina gluten-free?
Ordinary semolina is generally made from durum wheat.
It therefore contains gluten.
Semolina appears in:
- Pasta
- Puddings
- Couscous
- Some baked goods
A gluten-free product may use alternative grains, but ordinary wheat semolina is not gluten-free.
12. Is couscous gluten-free?
Traditional couscous is made from durum wheat semolina.
It contains gluten.
However, some products marketed as gluten-free couscous are made from alternatives such as maize or rice.
Check the product rather than relying on the food name alone.
13. Is spelt gluten-free?
No.
Spelt is a type of wheat and contains gluten.
It is not suitable for a strict gluten-free diet.
Some people assume spelt is gluten-free because it is marketed as an ancient grain.
That is incorrect.
For someone with wheat allergy, spelt is also relevant because it is wheat.
14. What about gluten-free beer?
Ordinary beer is often made with barley or wheat.
Gluten-free beers may use naturally gluten-free grains or processes designed to reduce gluten.
The method matters because testing hydrolysed or fermented gluten can present analytical challenges.
For coeliac disease, use reliable product-specific guidance and appropriate gluten-free labelling.
Do not assume a beer is gluten-free simply because it is described as low gluten.
15. Gluten-free vs wheat-free: real shopping scenarios
Here are five fictional examples showing why the distinction matters.
Example 1: Gluten-free bread with wheat starch
Gluten-free bread (front of pack: gluten-free)
Ingredients: Gluten-free wheat starch (wheat), water, yeast, vegetable oil, salt.
For coeliac disease: The gluten-free claim is relevant.
For wheat allergy: The wheat-derived ingredient requires separate consideration.
Example 2: Wheat-free rye crackers
Rye crackers (front of pack: wheat-free)
Ingredients: Rye flour, sunflower oil, salt.
For coeliac disease: Rye contains gluten, so these crackers are not suitable for a gluten-free diet.
For wheat allergy: The absence of wheat as an ingredient is relevant, but cross-contact and individual advice may still matter.
Example 3: Buckwheat noodles with wheat flour
Buckwheat noodles
Ingredients: Buckwheat flour, wheat flour, water, salt.
For coeliac disease: Contains gluten from wheat.
For wheat allergy: Contains wheat.
The word buckwheat on the front does not make the product wheat-free.
Example 4: Gluten-free almond cake
Almond cake (front of pack: gluten-free)
Ingredients: Almond flour (almonds), sugar, eggs, butter (milk).
For coeliac disease: The gluten-free claim is relevant.
For someone with milk, egg or almond allergy: The product contains other declared allergens.
Gluten-free never means allergen-free.
Example 5: Oat drink without a gluten-free claim
Original oat drink
Ingredients: Water, oats, sunflower oil, salt.
For coeliac disease: The ingredients list alone does not establish whether the product meets the gluten-free standard.
For wheat allergy: Oats are not wheat, but product-specific cross-contact information and individual requirements matter.
16. How to check gluten-free and wheat-free products in the supermarket
Use this practical checklist.
Step 1: Identify the requirement
Is the food being checked for coeliac disease, wheat allergy or another reason?
The answer changes which ingredients and claims matter.
Step 2: Read the front-of-pack claim
Look for gluten-free or wheat-free wording.
Do not assume the two are interchangeable.
Step 3: Read the complete ingredients list
Look for wheat, barley, rye and relevant derivatives. For ingredients like maltodextrin, yeast extract or modified starch, see Is it gluten-free? 25 confusing ingredients explained.
Step 4: Check wheat-derived ingredients
Gluten-free wheat starch is particularly important for wheat allergy.
Step 5: Check oats
For coeliac disease, look for suitable gluten-free oat products and follow individual guidance.
Step 6: Review precautionary information
Check relevant 'may contain' warnings and consider the person's specific guidance.
Step 7: Check the current packaging
Ingredients and manufacturing arrangements can change.
Don't rely only on a product you purchased previously.
Step 8: Ask if the information is unclear
Contact the manufacturer or seek appropriate specialist guidance rather than guessing.
Read our complete guide to checking food labels.
17. Can ingredients change without the barcode changing?
Sometimes.
Manufacturers may reformulate products, change suppliers or alter precautionary statements.
Depending on the type of change and applicable product identification rules, a barcode may remain the same.
This means an old product database record might not reflect every detail of the packaging you're holding.
Checking the current label helps you review the information supplied with that particular product.
Read our barcode versus ingredient label scanning guide.
18. How ClearaScan helps with gluten and wheat label checking
ClearaScan is designed to help people review ingredient labels against personalised Ingredient Guard rules.
Read the actual label
Photograph the ingredient list on the product you're holding.
Check recognised ingredients
The app checks recognised text against your selected rules.
Use different family profiles
One person may need to avoid wheat.
Another may need to check gluten-containing ingredients.
ClearaScan supports different Ingredient Guards for different profiles.
Review the result
Flagged ingredients can help draw attention to relevant label information.
However, the app does not measure gluten content.
It cannot establish whether a product meets the 20 ppm gluten-free threshold.
It cannot verify gluten-free certification or determine the clinical suitability of processed wheat starch for someone with wheat allergy.
An ingredient scan is not a substitute for appropriate gluten-free labelling, reliable product information or individual medical advice.
Always verify the original packaging.
