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Sublingual Immunotherapy: A Solution for Food Allergies

Thanks to recent medical updates, suffering from allergies doesn’t have to be a life sentence of permanent avoidance! We even have an exciting treatment solution available to help restore optimal health by reducing your allergic response to pollens and foods too (1). Let me tell you a bit more about it right now.

How Allergies Start

Here’s a little “Immune System 101” to provide some quick and pertinent information as to why people suffer from allergies and how these allergies contribute to thyroid dysregulation.

All immune responses start with an initial encounter or sensitization to something recognized as foreign to you – typically, it is to a surface protein on a bacteria/virus, a pollen and even a food protein.

This is not the same as eating protein. Instead, cells, whether belonging to plants, animals or to you, display these proteins on their surface, similar to how boats display flags to communicate to one another. These proteins communicate whether they belong to you or are “foreign”.

This foreign invader enters the body, either by inhaling or ingesting it, and your immune system surveys these “invaders” and creates antibodies specific to those surface proteins. These antibodies mark targets for destruction and become your immune system’s “memory” so that whenever re-exposed, your immune system can create a faster immune response.

Key Insight: A byproduct of this destructive immune response is generalized inflammation in the body and tissue damage.

You can see how something like food or pollen – which can be really difficult to avoid – can be a huge source of body-wide inflammation (because we are exposed to these “invaders” on a regular basis).

Intolerances vs Allergies

Let’s try and put this debate to rest.

The first antibody produced is “IgM” which you can think of as a “precursor” to other antibody classes. IgM antibodies can change into either IgG antibodies or IgE antibodies. Depending on which type the IgM switches to, the response in the body will be different.

If your IgM antibodies switch to the IgE-type you will experience a quick, localized release of histamine which can cause symptoms like:

  • Itchy eyes
  • A runny nose
  • Stomach pain (if ingested)

These are typically referred to as “allergies” in the medical community (2).

Key Insight: A severe, systemic, quick release of histamine can produce an anaphylactic response, causing air passages to close up and could be deadly.

If, however, your IgM antibodies switch to the IgG antibody class, you may experience a low grade, persistent type of reaction, causing vague symptoms long after an offender is inhaled or eaten.

Ultra Fiber - Dr. Alan Christianson

Allergies surrounding IgG antibodies are typically termed “intolerances” but they are still an immune response – they’re just at a slower rate of response. It may take a week, or even longer, to notice that the food is affecting you. These are what we call “hidden intolerances.”

Symptoms may include:

  • Gas
  • Bloating
  • Headaches
  • Psoriasis or eczema

Bottom Line: The “switching” into IgG or IgE doesn’t make the allergic reaction stronger or less1. Whether you call it “allergy” or “intolerance” – it’s still an immune response causing body-wide inflammation and symptoms are a byproduct of that.

How The Immune System Affects Thyroid

Allergies are a classic example of the immune system shooting first and asking questions later.

The issue, though, is that if the immune system is too highly motivated it can start to attack important parts of our bodies that we need and that exist inside of us and that is what auto-immune diseases are – like our thyroid (3).

How Multiple Food Allergies Develop

Now, if you have become sensitized to one of the surface proteins on a food, it is not uncommon that your intestinal tract and your immune system is in a state that allows it to start to sensitize to most anything else that you have on a regular basis.

If you are already reactive to eggs, or gluten, perhaps it is not uncommon that if you have almonds on a regular basis they may become reactive, too. Some of the secondary intolerances may not have triggered reactions, to begin with. They may not have started out as intolerances, but I think about those as the piggyback reactions. Those are things to where you already have something bothering you and they may start to become problems.

Key Insight: These food triggers are worth testing for and there are many labs available, some of which are more accurate than others in terms of just reproducibility (4).

Treatment Options: Desensitization and Tolerance to Food Allergens

The good news is there are ways to test for food and airborne allergens and, even better news, to desensitize or train your immune system to ignore common “offenders” that it doesn’t need to worry about!

One treatment that retrains your immune system is something called “Allergy Immunotherapy.” The concept was based on Native American populations that would eat poison ivy leaves in order to reduce the effects of an immune response. The ultimate goal of treatment is “tolerance”, which is the ability to ingest certain foods without allergic symptoms.

There are various forms of Allergy Immunotherapy. The more commonly known method is Subcutaneous ImmunoTherapy (SCIT), also known as “allergy desensitization shots” where patients go to an allergy specialist who administers injections.

Initially, patients have to go every week to get their shots, and then it’s spaced out to monthly injections. In order to obtain tolerance, monthly injections need to be kept up for about 3-5 years. Typically, a lot of patients fall off the wagon and don’t see this treatment through to its end, due to it being an inconvenience.

Luckily, there are other forms of allergy immunotherapy, dosed orally, offering more convenience and effectiveness.

Oral ImmunoTherapy (OIT)

OIT involves the daily administration of food allergens in milligrams to grams dosing, in gradually increasing doses over months to years. Recent trials have shown efficacy and safety data as well as compelling evidence that OIT frequently induces desensitization, and possibly even tolerance, in patients with food allergies2.

Sublingual ImmunoTherapy (SLIT)

Similarly, another form of oral immunotherapy involves the administration of small drops of allergen extract under the tongue – hence “SubLingual ImmunoTherapy.” Like OIT, treatment involves administering gradually increasing doses of the allergen over time.

Doses are approximately 1000-times less than OIT doses, but SLIT protocols include similar escalation and similar outcomes as OIT.

What’s good about OIT and SLIT is desensitization occurs via daily self-administration conveniently administered at home. Since patients don’t have to travel to a clinic there is greater compliance and consistency of treatment, leading to faster treatment outcomes.

Bottom Line: Treatment times can last anywhere from 3 – 12 months and patients can experience symptom reduction and/or relief in less than 3 months. That’s a huge time-saver compared to the average treatment time of 3-5 years with allergy desensitization shots!

Is SLIT Safe?

SLIT is a very old treatment modality (the earliest description coming all the way from 1900) and it is commonly used in Europe. Over the last 20 years, the European medical community produced a large amount of high-quality evidence suggesting that SLIT is safer than SCIT and OIT because of the low dose required for treatment3,4.

SLIT for Allergens

Just as foods can cause an immune response, airborne allergens like pollens, dust mites, and pet dander can also cause allergies.

For those patients with thyroid disease with difficulty stabilizing the TSH with medication, allergies are super important to address using SLIT against your specific airborne and food allergies.

SLIT Treatment

The first step is to test – don’t guess! A simple blood test can tell our doctors what food and airborne allergens are bogging down your immune system and affecting your thyroid.

Once we get the results, a compounding pharmacy develops the sublingual drops specific to your results. The first sublingual administration will occur in our clinic to make sure no severe allergic reactions occur. After that, patients take their sublingual therapy home for daily self-administration.

Most importantly, SLIT can help with the following symptoms. So that, if you’re suffering, you can experience relief sooner than you think:

Symptoms SLIT Can Help With:

  • Sneezing
  • Watery, itchy eyes
  • Chronic sinus infections
  • Chronic ear infections
  • Asthma
  • A chronic cough
  • Eczema
  • Hives
  • Angioedema
  • Muscle and joint pain
  • Headaches
  • Fatigue
  • Gas, bloating
  • Eosinophilic esophagitis
  • Interstitial cystitis
  • Celiac disease
  • Gluten sensitivity

Don’t suffer from allergies one day more! If allergies are contributing to thyroid instability and other health concerns, get tested and desensitize your immune system with safe and effective SubLingual ImmunoTherapy.

Are you a candidate for SLIT for foods or airborne allergies? Find out with a live, online one on one visit with an IH doc. CLICK HERE for more information.


Written by Dr. Raquel Espinol of Integrative Health. Dr. Raquel Espinol, Associate Physician with Integrative Health specializing in Thyroid, Adrenal, Male/Female Hormonal imbalances and weight loss management.

Learn more about Dr. Espinol here.