Garlic allergy and intolerance – what’s the difference?
What does it mean to be “allergic to garlic”?
Garlic allergy is very rare , but it can trigger a strong immune response. The immune system mistakenly identifies certain proteins in garlic as dangerous, which triggers symptoms such as:
- skin reactions ,
- breathing problems ,
- nausea or cramps ,
- in very rare cases even anaphylaxis (a life-threatening reaction).
Raw garlic is the most common cause of problems, as it contains the enzyme alliin lyase , which is a strong allergen.
How to recognize allergy symptoms?
Reactions can occur upon contact or ingestion. Common symptoms include:
- Contact dermatitis : red, itchy skin or cracks on the fingers after cutting garlic. (1*)
- Digestive symptoms : nausea, abdominal cramps, diarrhea. (2*)
- Swelling in the mouth : itching of the tongue or throat. (2*)
- Anaphylaxis : very rare, but possible – rapid swelling, difficulty breathing, drop in blood pressure. (2*)
Garlic intolerance – much more common
Although garlic allergy affects very few people, intolerance is much more common .
Intolerance does not involve the immune system , but the body cannot properly digest certain components in garlic – for example, fructans (a type of FODMAP carbohydrate) or histamine. As a result, sensitive people may experience: (2*)
- bloating ,
- winds ,
- heartburn or reflux ,
- diarrhea or cramps after eating garlic.
So it’s a digestive reaction , not an allergy – and it’s not life-threatening, but it can significantly reduce the quality of life.
How to make a diagnosis?
If you suspect that garlic is causing you harm, consult an allergist or gastroenterologist . Diagnostic procedures include:
- discussion of symptoms and history,
- skin test (prick test) or blood test for antibodies (IgE),
- sometimes also controlled testing with a small amount of garlic (so-called “oral challenge”).
What to do in everyday life?
- Check the ingredients – garlic is hidden in many processed products (sauces, spices, meat products).
- Be careful in restaurants – tell the staff that you are not allowed to eat garlic.
- Substitute flavor – use spices such as cumin, ginger, coriander, black pepper, or fennel.
- Cooked garlic is milder – but NOT safe for allergy sufferers! However, some people with intolerances may tolerate it better.
- In case of intolerance, your doctor may recommend a low-FODMAP diet or mild digestive medications.
Be careful, but don’t panic.
Although garlic allergy is rare, it can cause serious reactions – so it is important to distinguish it from the more common intolerance , which mainly affects digestion.
If you suspect a food allergy, the best course of action is to consult a doctor and get a diagnosis . With a little attention and the right substitutes, you can still enjoy a delicious and safe diet.
Literature: (*)
- Source: Garlic-related dermatoses: case report and review of the literature, (U. Jappe, B. Bonnekoh, BM Hausen, H. Gollnick), https://pubmed.ncbi.nlm.nih.gov/10072338/
- Food Allergy Vs Food Intolerance in Patients With Irritable Bowel Syndrome, (SE Crowe), https://pmc.ncbi.nlm.nih.gov/articles/PMC6423694/
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