Lettuce Allergy

A food allergy occurs when your immune system responds abnormally to proteins in certain foods. When you think of food allergies, foods such as nuts, eggs and shellfish most likely come to mind. While a lettuce allergy is uncommon, it does exist. A lettuce allergy differs from an intolerance in that the immune system is involved in allergic reactions. Talk to your doctor if you suspect that you have a lettuce allergy, especially because food allergy reactions can be life threatening.

A head of lettuce.
Credit: Stockbyte/Stockbyte/Getty Images

A Lesser Known Food Allergy

You may experience allergic reactions such as itching or swelling of the mouth, hives, digestive upset or tightening of the throat, if you're allergic to lettuce. Researchers in Spain sought to determine the specific allergen responsible for causing anaphylaxis -- a severe allergic reaction -- in two patients who had eaten lettuce. The team identified lipid transfer protein LAC S-1 as the allergen in both cases. The results were published in the 2009 edition of the "Journal of Investigational Allergology and Clinical Immunology." Your doctor can perform a test, called an immunoassay, to determine whether you have a lettuce allergy. You will need to avoid lettuce if the test comes back positive.

Load Comments

Copyright © 2019 Leaf Group Ltd. Use of this web site constitutes acceptance of the LIVESTRONG.COM Terms of Use , Privacy Policy and Copyright Policy . The material appearing on LIVESTRONG.COM is for educational use only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. LIVESTRONG is a registered trademark of the LIVESTRONG Foundation. The LIVESTRONG Foundation and LIVESTRONG.COM do not endorse any of the products or services that are advertised on the web site. Moreover, we do not select every advertiser or advertisement that appears on the web site-many of the advertisements are served by third party advertising companies.