Food sensitivities and food allergies (or intolerances) are increasingly common. You’ve heard of nut-free schools and gluten-free foods, and yes, some people truly need to avoid even the tiniest traces of these foods. In fact, millions of Americans experience allergic reactions to foods every year. While most reactions are mild, some can be life-threatening and require emergency treatment or hospitalization.

Where do food allergies and food sensitivities come from? How do we know whether our symptoms are from an allergy or sensitivity? What are the best ways to prevent, treat, and live with them? Keep reading to find all of the essential answers in this blog post.


Food Sensitivities vs. Food Allergies 

Food allergies are simply an abnormal response to food that’s triggered by the immune system (the system that fights infections). It happens when the immune system mistakes a non-harmful food, like peanuts, tree nuts, shellfish, milk, soy, fish, eggs, wheat, for a serious invader and overreacts to it. The immune system creates a specific type of compound called an IgE antibody that is responsible for most of the symptoms of true allergies. These IgE-mediated allergic reactions can be non-serious or serious and life-threatening.

Allergies are often first noticed during childhood but they can develop at any age and may last for a lifetime. Mild allergic reactions to a food may result in more serious symptoms the next time it is eaten. So, after your first reaction—even if it’s mild—it’s important to speak with your healthcare provider to see if you should go for allergy testing or carry emergency medication (more on this below).

It’s unclear exactly where food allergies come from. Research shows that they could partly be genetic (inherited in the genes you’re born with). Gut microbiota may also influence your chance of developing food allergies. New studies show that introducing young children to peanuts may reduce their chances of developing serious peanut allergies. (Speak with your healthcare provider before introducing your child to peanuts.)

Unfortunately, there is no cure for food allergies but reactions can be prevented. In an allergic reaction, the production of IgE antibodies is triggered by a protein in the offending food. Any food has the potential to cause an allergic response, however, there is a short list of foods that account for most reactions. These common food allergens must be declared on package labels, according to the FDA. Common food allergens include:

  • Peanuts
  • Tree nuts (e.g., almonds, walnuts, pecans)
  • Fish (e.g., cod, bass, flounder)
  • Shellfish (e.g., crab, lobster, shrimp)
  • Eggs
  • Milk
  • Wheat
  • Soy

Many clients throughout Arizona, including Scottsdale & Phoenix, come to me for food sensitivity testing. Many food sensitivities are often mistaken for allergies. Food intolerances can cause many symptoms after eating offending foods but what differs is that these symptoms are not the result of the IgE antibodies. That’s what makes them a sensitivity and not an allergy. Food sensitivity is a delayed reaction your body gives to a specific food unlike food allergy where the reaction is right away. Many times people are unaware of food sensitivities. The food allergy test may show that you are NOT allergic to certain food but the food sensitivity test may show that you are actually sensitive to that food. For example – you may not be allergic to strawberries based on a food allergy test but you can be sensitive to strawberries when you do a food sensitivity test.

Many studies have shown that the root cause for the food sensitivity is poor or imbalanced gut health. If you think you are dealing with gut issues, it is likely that you are also dealing with food sensitivities. Download my free, quick guide, on “5 ways to support your gut health”




Five Common Food Sensitivities, Food Allergies and Food Intolerances 

There are several different types of food sensitivities and allergies. Here is a short list of the most common reactions.

1) Anaphylaxis or anaphylactic shock

This is usually a very fast, life-threatening reaction that can occur when exposed to specific foods, medications, or stinging insects (e.g., bees). Symptoms can include sneezing, coughing, itching, hives, swelling, blood pressure drop, abdominal pain, dizziness, tightness in the throat, and shortness of breath. The main treatment for an anaphylactic reaction is an epinephrine auto-injector and calling 9-1-1. Avoiding what caused your reaction is necessary to prevent future life-threatening reactions which may be even worse than the first one.

2) Oral allergy syndrome or Pollen-food allergy syndrome 

When symptoms such as rash, itching, sneezing, and swelling occur around the mouth, lips, and tongue, this is called oral allergy syndrome. Foods commonly associated with this syndrome include raw apples, bananas, cherries, kiwis, peaches, celery, tomatoes, potatoes, melons, and hazelnuts. This type of allergic reaction is not life-threatening and is common among those who are also allergic to grass and ragweed pollen (hence the name pollen-food allergy syndrome). Cooking the fruit or vegetable often reduces the symptoms because the heat breaks down the proteins responsible for this type of non-life-threatening reaction.

3) Eosinophilic Esophagitis 

Heartburn-like symptoms, nausea, vomiting, abdominal pain, or difficulty swallowing after eating certain foods may be eosinophilic esophagitis associated with food allergies. If this happens, it’s important to speak with your healthcare provider to see if you should get tested for allergies or need medications. Avoiding foods that cause this reaction is key.

4) Lactose Intolerance

Lactose is a sugar found in milk that can cause gas to build up in the gastrointestinal [digestive/GI] tract. This is not an allergy, but rather an inability to effectively digest it. Lactose is a two-part sugar molecule that needs the enzyme lactase to break it down. When someone does not have enough active lactase in their digestive [gastrointestinal/GI] tract, lactose remains intact and causes abdominal pain, nausea, excess gas, bloating, and diarrhea.

5) Celiac Disease or Gluten Intolerance

Gluten is a protein found in many grains such as wheat, rye, and barley. While intolerance to gluten involves the immune system, it differs from allergies by the specific antibodies involved (allergies involve IgE antibodies, while gluten intolerance does not).



~ Living with Food Sensitivities and Food Allergies ~

The best way to deal with food allergies and sensitivities is to avoid those foods that cause reactions for you. Here are my best strategies to deal with them.

  1. Read your food labels carefully. To help you avoid foods that you react to, most pre-packaged foods must clearly identify if they contain any of the major food allergens (or contain the immune-triggering protein of the major food allergens). Look at the list of ingredients, “allergen free” claims, and also for statements like “may contain” or “produced in a facility that also uses.”
  2. Wash your hands, surfaces, dishes, and utensils well to prevent accidental cross-contamination between offending foods and other foods.
  3. If you’re eating out, confirm whether the meal is free from the food you’re allergic to before placing your order.
  4. Food allergens may also be added to certain medications and cosmetics, so check those labels or ask your pharmacist before purchasing.
  5. If you experience an anaphylactic reaction, the FDA says that “Persons with a known food allergy who begin experiencing symptoms while, or after, eating a food should initiate treatment immediately, and go to a nearby emergency room if symptoms progress.”
  6. If you have had a serious anaphylactic reaction, it’s important to carry an epinephrine auto-injector in case of accidental exposure. This is a lifesaving medication that can help maintain your blood pressure and restore your ability to breathe. You can ask your pharmacist whether a prescription from a medical doctor is needed. Be sure to learn how to use it properly and replace it as it reaches the expiry date.
  7. Anaphylaxis is a condition where you may consider wearing a medical alert bracelet or necklace.
  8. For lactose intolerance, all milk products do not need to be strictly avoided, provided they are consumed with the lactase enzyme (available as a dietary supplement) or have been pre-treated with the lactase enzyme (e.g., lactose-free milk). These ensure that the lactose has already been broken down for you and should not cause symptoms of intolerance.
  9. If you believe that you may have a food sensitivity or allergy see your healthcare provided to discuss getting tested.

~ Final Thoughts on Food Sensitivities ~

Food sensitivities and allergies are increasingly common. There are several different kinds and most are not serious or life-threatening, however, they all cause unwelcome symptoms. As a general rule, avoiding the offending foods is highly recommended. This post contains several essential tips on how to live with food allergies and sensitivities.

If you believe you have a serious food allergy, it’s critical that you see your healthcare provider to determine if you need to carry emergency medication for future exposures. If you think you may be sensitive to certain foods I offer food sensitivity testing to my clients in Arizona and nationwide.

For a customized plan designed to help you enjoy the meals you love minus the few foods that you may be allergic or sensitive to, consult a Registered Dietitian / Nutritionist, like myself, who can provide personalized research-based nutrition advice for your health, lifestyle, and goals.

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