Gluten free on a Spanish menu: what it guarantees
The gluten free description may only be used where a food contains less than twenty milligrams of gluten per kilogram, and an establishment using it must be able to support that claim in both ingredients and preparation.
gelisted editorial team · Updated 15 August 2026
The short version
- The legal threshold for gluten free is 20 mg per kg.
- Very low gluten sits below 100 mg per kg.
- A shared fryer is the most frequent source of contamination.
- Coeliac disease affects around 1 per cent of the population.
For someone with coeliac disease there is no such thing as a small amount. Crumbs on a shared board are enough to produce a response lasting days.
What the term means
European rules reserve the gluten free description for foods containing less than 20 milligrams of gluten per kilogram, and very low gluten for those below 100 milligrams per kilogram. These are not marketing labels: using the first without meeting the threshold is an offence. A restaurant putting it on the menu is making a statement with legal consequences.
| Critical point | Risk | Solution |
|---|---|---|
| Shared fryer | very high | separate oil and basket |
| Shared griddle | high | reserved zone or cooking paper |
| Board and knife | high | dedicated utensils |
| Bread toaster | very high | toasting bag or separate unit |
| Airborne flour | high | prepare before service |
| Thickened sauces | medium | check the thickener |
| Legal threshold | 20 mg/kg | |
| Very low gluten | under 100 mg/kg |
The ingredients that surprise
Many sauces are thickened with flour. Some charcuterie contains starch. Certain stock concentrates and soups contain wheat. Industrial chips can carry a coating. And oats, although naturally compatible, are frequently contaminated during transport and milling, so only certified oats are suitable. Asking about those 5 points covers most incidents.
What to ask at the table
Whether the fryer is dedicated. Whether the dish is prepared with separate utensils. Whether the sauce contains a flour thickener. And whether gluten free bread is toasted in the same appliance as the rest. Specific answers indicate a kitchen with a protocol; vague ones suggest choosing a simple grilled dish with vegetables and oil, which is the lowest risk option anywhere.
Telling the restaurant when booking gives the kitchen time to organise, which cannot be improvised during service.
When the information is wrong
Stating that a dish is gluten free when it is not is an offence under food information and consumer rules. After a reaction, keep the receipt, photograph the menu, request the complaints book and obtain a medical report. Those four elements support the complaint, which is handled through the consumer route with a usual response period of 10 working days.
The 20 milligrams per kilo threshold works out at roughly 10 milligrams of gluten a day on a normal diet, and a single breadcrumb of 50 milligrams already exceeds it. That is why a shared board, or 2 seconds on a common griddle, is enough to ruin a dish that was correct on paper.
Frequently asked
+What does gluten free mean on a menu?
That the food contains less than 20 milligrams of gluten per kilogram, the threshold set in European rules.
+Where is the greatest risk in a kitchen?
The shared fryer, followed by the griddle, boards and the bread toaster.
+Which ingredients are easily missed?
Flour thickened sauces, charcuterie with starch, stock concentrates and uncertified oats.
+Should I mention it when booking?
Yes. It gives the kitchen time to organise utensils and the order of preparation.
+What if the dish was not suitable?
Keep the receipt, photograph the menu, request the complaints book and obtain a medical report.
Sources
- 1Regulation (EU) 1169/2011 on food information, European Union (August 2026)
- 2Ministerio de Sanidad, Gobierno de España (August 2026)