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Food allergies and intolerances: How prepared are restaurants in downtown Lisbon? Cover

Food allergies and intolerances: How prepared are restaurants in downtown Lisbon?

By:  and    
Open Access
|Aug 2026

Figures & Tables

Table 1:

General characteristics of employees according to function performed

Total sample (n=34)Manager (n=4)Cook (n=4)Waiter (n=24)Kitchen assistant (n=2)
Age, years*38.4 (14.0)44.2 (16.0)45.5 (10.53)37.0 (14.38)29.5 (7.77)
How long have you been performing this function, in months?*104.1 (123.92)198.0 (163.5)141.0 (165.80)87.0 (111.73)47.0 (52.3)
Have you ever had any training on food allergies/intolerances? %(n)
Yes8.8 (3)25.0 (1)0.00 (0)8.3 (2)0.00 (0)
No91.2 (31)75.0 (3)100.0 (4)91.7 (22)100.0 (2)

1* Data expressed as mean and (SD)

Table 2:

Frequency of responses regarding employees’ knowledge about allergens

TrueFalseI don’t know
% (n)
Which of the following foods/food items are considered allergenic?
Eggs and egg products91.2 (31)8.8 (3)0.0 (0)
Tomatoes and tomato products29.4 (10)67.6 (23)2.9 (1)
Oregano and products containing oregano.17.6 (6)73.5 (25)8.8 (3)
Milk and milk-based products (except lactose-free products)97.1 (33)2.9 (1)0.00 (0)
Celery and celery-based products20.6 (7)73.5 (25)5.9 (2)
Mustard and mustard-based products67.6 (23)26.5 (9)5.9 (2)
Table 3:

Frequency of responses regarding employees’ knowledge of the concepts of food allergy and intolerance

Statement presentedTrueFalseI don’t know
% (n)
1. A food allergy manifests itself through a response of the immune system when exposed to a specific food/food product.73.5 (25)2.9 (1)23.5 (8)
2. An individual who comes into contact with a food to which they are intolerant may develop an anaphylactic reaction, which can be fatal.47.1 (16)52.9 (18)0.00 (0)
3. An individual allergic to eggs can consume very small amounts of this food.14.7 (5)85.3 (29)0.00 (0)
4. A food intolerance is characterized by an exaggerated reaction of the body to a particular food consumed that does not trigger an immune response.67.6 (23)11.8 (4)20.6 (7)
5. Food intolerances mainly manifest as gastrointestinal symptoms such as nausea, cramps, or diarrhoea, and unlike allergies, they do not have fatal consequences.94.1 (32)5.9 (2)0.00 (0)
6. In food allergies, symptoms appear between a few minutes and two hours after contact with the allergen and include only gastrointestinal manifestations.58.8 (20)38.2 (13)2.9 (1)
7. Food intolerance is related to the body’s ability to digest food, while food allergy can occur through different routes, including skin or inhalation.52.9 (18)32.4 (11)14.7 (5)
Table 4:

Frequency of responses regarding employees’ knowledge about cross-contamination and best practices to be implemented

Statement presentedTrueFalseI don’t know
% (n)
1. A specific cutting board is not required to prepare food for a customer with allergies/intolerances.17.6 (6)82.4 (28)0.00 (0)
2. Small amounts of allergen are not capable of causing allergies.11.8 (4)88.2 (30)0.00 (0)
3. The table where the customer will be seated, as well as the cutlery and utensils to be used by the customer, must be carefully cleaned.100.0 (34)0.00 (0)0.00 (0)
4. If I detect that there was a mistake in preparing a dish for a customer with allergies/intolerances, I must remove the allergenic ingredient and serve the dish again.61.8 (21)38.2 (13)0.00 (0)
5. Frying oil is a vehicle for cross-contamination and therefore new oil should be used exclusively for frying foods that will be on the plate of a customer with allergies/intolerances.82.4 (28)14.7 (5)2.9 (1)
6. Only kitchen staff should be aware of and exercise special care in their work practices when dealing with a customer with allergies/intolerances.14.7 (5)85.3 (29)0.00 (0)
7. If there is any doubt about the presence of a particular allergen in the menu or food product, the employee should say that they do not know and advise the customer to make another choice.100.0 (34)0.00 (0)0.00 (0)
8. The table designated for customers with allergies/intolerances should, whenever possible, be located away from the kitchen due to the potential inhalation of fumes.44.1 (15)44.1 (15)11.8 (4)
9. The restaurant provides as much information as possible on its menu about the ingredients that make up each dish, as well as any allergens that may be present. Example: “Bacalhau à Zé do Pipo” (cod, mashed potatoes, mayonnaise) contains milk, gluten and egg.82.4 (28)17.6 (6)0.00 (0)
10. The technical specifications contain all the ingredients present in the dish and are duly updated whenever there are changes.100.0 (34)0.00 (0)0.00 (0)
11. Employees are informed whenever there are changes to the ingredients in any dish listed in the recipe cards.100.0 (34)0.00 (0)0.00 (0)
12. In the absence of the Head Chef, the recipe cards are always available for consultation.100.0 (34)0.00 (0)0.00 (0)
DOI: https://doi.org/10.2478/ejthr-2026-0025 | Journal eISSN: 2182-4924 | Journal ISSN: 2182-4916
Language: English
Page range: 326 - 334
Submitted on: May 5, 2026
Accepted on: Jul 24, 2026
Published on: Aug 31, 2026
Published by: Polytechnic Institute of Leiria
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2026 Bruno Sousa, Catarina Conde, published by Polytechnic Institute of Leiria
This work is licensed under the Creative Commons Attribution 4.0 License.