Food Sensitivity Tests: Unraveling the Controversy

If you’ve ever experienced bloating, gas, constipation, diarrhea, stomach pain, fatigue, or just a general sense that certain foods “don’t agree with you,” you’ve probably wondered whether a food sensitivity could be the reason. And if you’ve searched for answers online, you’ve likely come across food sensitivity tests promising to tell you exactly which foods are causing your symptoms.

The appeal is obvious.

Instead of spending months wondering What is wrong with me?, you get a list of foods to avoid. For dancers, that can sound especially appealing. When digestive symptoms interfere with rehearsals, performances, or simply your confidence around food, having a clear answer can feel like a huge relief.

But there’s a problem.

Many of the food sensitivity tests marketed directly to consumers cannot actually tell you which foods are causing your symptoms. And the results can sometimes create more problems than they solve.

I’ve written before about topics including anti-inflammatory diets, hypermobility, and digestive health, and one thing continues to come up in my work with dancers: When your stomach doesn’t feel right, it is completely understandable to want answers. But not every test promising an answer is actually capable of giving you one.

Let’s unpack the controversy.

First: What does “food sensitivity” actually mean?

The term food sensitivity gets used constantly, but it does not have one universally accepted medical definition. In fact, it’s not even considered a true medical diagnosis. It is also frequently used interchangeably with terms like food allergy and food intolerance, even though these are not the same thing.

To review, a food allergy involves an immune response to a food. IgE-mediated food allergies can cause symptoms such as hives, swelling, vomiting, wheezing, difficulty breathing, or anaphylaxis. When a true food allergy is suspected, an allergist may use a detailed medical history along with appropriately selected testing. Importantly, a positive allergy test by itself does not establish that a person has a clinical food allergy. The test results have to be interpreted in the context of actual symptoms and the individual’s history.

A food intolerance is different. It generally refers to difficulty tolerating or digesting a particular food or component of food without the immune response characteristic of an allergy. Lactose intolerance is one familiar example.

And then there are nonspecific digestive symptoms, sometimes called functional digestive disorders. Bloating, gas, abdominal discomfort, constipation, and diarrhea can have many potential causes. Sometimes food plays a role. Sometimes the issue is the amount or combination of foods being eaten, meal timing, stress, changes in routine, inadequate fueling, constipation, an underlying gastrointestinal condition, or something completely unrelated to food.

That is why a single test rarely tells the whole story.

What are food sensitivity tests?

The term food sensitivity test can refer to several different things, but you’ll commonly see:

1. IgG food panels, which measure immunoglobulin G antibodies to numerous foods.
2. Microbiome or stool-based testing, sometimes marketed as a way to identify digestive “imbalances” or food triggers.
3. Genetic testing, which may claim to identify a person’s likelihood of reacting poorly to particular foods.

These tests are often sold directly to consumers as convenient at-home kits. They may also be promoted through functional medicine, wellness, and integrative health settings.

The marketing can be incredibly persuasive. I always appreciate when a dancer wants to take charge of their health and performance, but before you spend hundreds of dollars and start eliminating foods from your diet, there are several important questions to ask.

The Problems With Food Sensitivity Tests

#1: Many popular tests aren’t validated for diagnosing food sensitivities

This is particularly important when it comes to IgG food sensitivity panels. IgG antibodies to foods can be present as part of a normal immune response to foods we regularly eat. In other words, detecting IgG to a food does not mean that the food is causing symptoms.

In fact, allergy organizations have specifically cautioned against using IgG testing to diagnose food allergy or food intolerance. The presence of food-specific IgG is generally understood as evidence of exposure and, in some contexts, tolerance rather than proof that a food is causing an adverse reaction. In other words, the presence of these antibodies can arguably be considered evidence of tolerance and desensitization, not intolerance.

Food sensitivity tests lack scientific validity, and this creates a major problem:

The test may give you an answer without actually answering the question you care about.

You may receive a long list of “positive” foods and assume those foods are responsible for your symptoms, when the test cannot establish that connection.

The same caution applies to many commercial microbiome and genetic tests. While research into the gut microbiome and genetics is advancing rapidly, much is still less understood, and having information about your microbiome or certain genetic variants does not automatically tell you which foods you should or should not eat.

A genetic association is not the same thing as a clinical diagnosis.

#2: They lead to false positives

This is where the conversation becomes particularly important for dancers. Imagine you take an at-home test because you’ve been experiencing bloating. Your results come back showing “reactivity” to:

• Wheat
• Dairy
• Eggs
• Almonds
• Bananas
• Tomatoes
• Soy
• Oats

Suddenly, foods you have eaten for years are labeled as problematic. You may start eliminating them one by one. Then you notice that you feel better. That must mean the test was right… right?

Not necessarily.

When you remove multiple foods at once, you have changed your entire eating pattern. You may also be eating smaller meals, eating less fiber, changing meal timing, avoiding foods you typically eat in large portions, or simply becoming more attentive to your symptoms.

There are many possible explanations for feeling different after an elimination diet. And once a food has been labeled “bad” or “inflammatory,” it can become surprisingly difficult to put it back on your plate.

#3: Unnecessary restriction can have real consequences

Eliminating one food may not seem like a big deal, but eliminating five, ten, or twenty foods can dramatically change the nutritional quality and flexibility of your diet. For dancers, this matters.

Dance already exists within a culture where food rules and body ideals can become deeply ingrained. Research has consistently identified elevated levels of eating psychopathology and restrictive eating behaviors among dancers, particularly ballet dancers.

So when a questionable test gives you a list of foods to avoid, the concern isn’t simply whether you’re missing a few nutrients. It’s what happens to your relationship with food. A test result can unintentionally reinforce thoughts like:

• “I can’t eat that.”
• “That food is inflammatory.”
• “My body doesn’t tolerate carbohydrates.”
• “I need to be more careful.”
• “I should probably cut out another food just to be safe.”

For a dancer already prone to food anxiety or restriction, this can become a slippery slope.

No, chances are you don’t need an elimination diet

Elimination diets can have a legitimate place in medical nutrition therapy, but “elimination diet” should not be synonymous with “the solution to digestive symptoms.”

There is a big difference between an evidence-based elimination trial conducted for a specific clinical reason and independently removing a long list of foods because an at-home test said you should. One example is the low-FODMAP diet, which can be useful for some people with IBS when implemented appropriately. But it is a structured therapeutic diet, not a general wellness diet. It has also been tied to severely disordered eating and is not intended to be followed indefinitely.

For dancers, I am especially cautious about restrictive protocols because the goal should always be to identify the least restrictive intervention that effectively manages symptoms while supporting adequate energy, carbohydrate, protein, fat, fiber, and micronutrient intake.

1. That might mean adjusting meal timing.
2. It might mean addressing constipation.
3. It might mean looking at the size of a pre-rehearsal meal.
4. It might mean evaluating hydration, caffeine, or overall fueling.
5. It might mean treating an underlying gastrointestinal condition.
6. And sometimes, yes, it may involve temporarily modifying specific foods.

But more restriction is not automatically better nutrition.

#4: They can delay the diagnosis you actually need

Perhaps the biggest concern with food sensitivity testing is that it can create a false sense of certainty. You may think: “I know what is causing my symptoms now.”

But what if you don’t? Persistent digestive symptoms deserve appropriate medical evaluation. For example, symptoms that someone attributes to “gluten sensitivity” could have many different explanations. If celiac disease is a possibility, eliminating gluten before testing can actually interfere with the diagnostic process.

Similarly, suspected food allergy requires an appropriate clinical evaluation rather than relying on a commercial food panel. This is why I don’t recommend using a food sensitivity test as your starting point.

Start with the symptom. Then investigate the cause. Not the other way around.

#5: They can make you afraid of foods you once enjoyed

This is the part that doesn’t always get discussed. Food is not simply a collection of nutrients. Food is also culture, connection, pleasure, convenience, tradition, and fuel for the things you care about. When a test tells you that twenty foods are “reactive,” it can change the way you look at your entire kitchen.

Suddenly, the banana you used to grab before class feels dangerous. The pasta you used to enjoy before rehearsal feels “inflammatory.” The yogurt you’ve eaten for years becomes something you need to avoid.

And even if the test was never capable of diagnosing a true intolerance in the first place, the fear can feel very real. Disordered eating among dancers is not an experience we should take lightly. Eating disorders have the second-highest mortality rate of any mental health disorder (second only to opioid addiction). Developing a healthy relationship with food requires more than knowing which foods contain which nutrients.

It also requires trust.

#5: They’re expensive and can drain resources

Food sensitivity tests can cost hundreds of dollars, and many are not covered by insurance. Before spending that money, ask yourself:

What will I actually do with the results?

If the answer is, “I’ll eliminate every food that comes back positive,” you could potentially spend a significant amount of money obtaining information that leads you toward unnecessary restriction.

That same money may be much better invested in an appropriate medical evaluation or working with a qualified registered dietitian who can help you investigate symptoms without unnecessarily shrinking your diet.

So what should you do if you think a food is bothering you?

Start with curiosity rather than restriction. Instead of immediately asking: “What foods do I need to eliminate?” Try asking: “What is actually happening?” Consider:

1. What are your symptoms? Bloating? Pain? Diarrhea? Constipation? Reflux? Nausea? Be specific.
2. When do they happen? Do symptoms occur immediately after eating, several hours later, or inconsistently?
3. What else is happening? Consider meal size, timing, hydration, stress, sleep, training load, bowel habits, and overall fueling.
4. Is there a medical condition that should be ruled out? Persistent or concerning symptoms deserve medical attention. Depending on your symptoms and history, your healthcare provider may recommend blood work, allergy evaluation, gastrointestinal testing, or other diagnostic procedures.
5. Can you work with a qualified dietitian? A registered dietitian can help you look for patterns without automatically turning every symptom into another food rule.

And if a therapeutic elimination diet is appropriate, a dietitian can help you implement it strategically and, importantly, work toward food reintroduction rather than unnecessary long-term restriction.

Key Takeaways

I completely understand why food sensitivity tests are appealing. When your stomach hurts before class, when you’re bloated during rehearsal, or when digestive symptoms are interfering with your performance, you want an explanation.

But a test that gives you a long list of foods isn’t necessarily giving you answers. And for dancers, a false sense of certainty can come at a very high cost. Your diet should not become smaller simply because a commercial test says it should. If you are experiencing persistent digestive symptoms, start with an appropriate medical evaluation. If food is suspected to play a role, work with qualified clinicians to identify the most evidence-based and least restrictive approach possible.

Because the goal isn’t simply to find more foods to eliminate. The goal is to help you feel better while keeping your diet as nourishing, flexible, and enjoyable as possible.