How Can You Develop a New Food Allergy When You Are Older? (2022)

You have eaten pineapple for as long as you can remember, but this time you find your lips tingle as you take a bite. Or maybe you ate your favorite shrimp scampi dinner only to discover you are covered with hives. Perhaps you are relaxing on your front porch when suddenly your eyes start getting itchy and your experience bouts of sneezing.

How Can You Develop a New Food Allergy When You Are Older? (1)

Is it possible that even as an adult you can suddenly develop allergies, both food and seasonal ones? The answer is anabsolute yes. In fact, it is somewhat common to have allergies develop during adulthood, with no prior history. While it occurs in only about 5% of the adult population, it is currently a condition that is on the rise.

How Allergic Reactions Happen

Allergic reactions occur when your body comes in contact with something that it internally believes is harmful. This can be a food or any substance, such as pollen. As a reaction, the body produces immunoglobulin E or IgE, which are antibodies. These antibodies, in turn, attach themselves to cells which then release histamine. Histamine causes reactions such as inflammation, redness in the eyes, along with tears and an itchy feeling. If the reaction is strong enough anaphylactic shock can result. The IgE antibodies typically serve to fight infections but sometimes they attack the allergens instead.

There is also a condition called oral allergy syndrome, which is a reaction to pollen, not to a particular food.In this case, the immune system recognizes the pollen and similar proteins in the foodand then causes an allergic reaction to it. This is not a true food allergy but is often confused as one.

Symptomsof Allergies

Allergic reactions can vary but some of the morecommon symptoms are hives, swelling, or lips or tongue, itchy eyes or skin, shortness of breath, trouble swallowing, drop in blood pressure, pale coloring of the skin, feeling faint or anaphylaxis. Most often the symptoms occur within two hours of ingesting the food in question, but in many cases, it can happen within even a few minutes of the first contact.

(Video) A Doctor Answers: Can You Develop Allergies As You Get Older + Can Food Impact Seasonal Allergies?

Top Eight Allergens

While you can be allergic to any food, the most common food allergies include milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soy. These foods make up about 90% of the reported food allergies in the United Statesand are required to be listed on any processed food according to the Food Allergen Labeling and Consumer Protection Act. In 2021, sesame joined the list and will have to be listed on food labels as of 2023.

Why This Happens

No one really understands what might make the body have this misguided reaction. You can show no symptoms for yearsand suddenly experience a reaction. Some researchers believe this can happen after there is a change in one’s environment and they are exposed to this allergen at a more substantial level than ever before. And at that level the body can no longer handle it, causing a reaction.

How to Handle Allergies

If you start to show symptoms of an allergy, it is important to consult your healthcare provider.Blood and skin testing can confirm your diagnosis so that you can learn how to safely handle your allergies. Once your allergies are diagnosed, a change in diet, allergy shots or medications may help to alleviate symptoms.

(Video) Adults suddenly developing new food allergies

So despite your age, be sure not to ignore any new reaction you might have to a food or substance. By paying close attention to this reaction, and determining its cause, you will be better prepared to eat safely and avoid further reactions.

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(Video) Updated guidance on the early introduction of allergens to prevent the development of food allergies

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4 Sources

(Video) Sudden food allergies?

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.

  1. Gupta RS, Warren CM, Smith BM, et al. Prevalence and severity of food allergies among US adults. JAMA Netw Open. 2019;2(1):e185630. doi:10.1001/jamanetworkopen.2018.5630

  2. Valenta R, Hochwallner H, Linhart B, Pahr S. Food allergies: the basics. Gastroenterology. 2015;148(6):1120-1131.e4. doi:10.1053/j.gastro.2015.02.006

    (Video) A Cure for Food Allergies

  3. American College of Allergy, Asthma & Immunology. Food allergy.

  4. Food & Drug Administration. Food allergies.


Can you develop food allergies as you get older? ›

Food allergies can develop in adults between the ages of 18 to 86. When the allergies occur in older adults, the symptoms tend to be severe. There are certain foods commonly associated with allergic reactions.

How do new food allergies develop? ›

Food allergies happen when the immune system – the body's defence against infection – mistakenly treats proteins found in food as a threat. As a result, a number of chemicals are released. It's these chemicals that cause the symptoms of an allergic reaction.

Why am I developing food allergies all of a sudden? ›

Life changes a trigger

Maybe you've moved and are being exposed to different allergens, which trigger your immune system. A viral or bacterial infection could also flip that switch. Hormones can be a catalyst, too, especially in women. It's not uncommon to develop food allergies during puberty, pregnancy or menopause.

How do you develop new allergies? ›

A common reason for developing new seasonal allergies is moving from one geographic region to another. If you grew up in an area that has certain plants and trees, then moved to another area that has a different mix of vegetation you've never been exposed to, you may develop allergies to those new plants.

Why am I developing allergies as I get older? ›

The emergence of allergies

Seasonal allergies may develop as you age because you have an increased amount of exposure to environmental allergens, such as pollen. You may outgrow allergies. Some experts believe that tolerance to allergens may develop as a person is exposed to very low levels of the allergen over time.


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