How to Prepare for a Food Sensitivity Test: A Step-by-Step Guide

How to Prepare for a Food Sensitivity Test: A Step-by-Step Guide

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Food sensitivities can have a significant impact on our health and well-being. They can cause a wide range of symptoms, from digestive issues and skin problems to fatigue and mood swings. Identifying and managing food sensitivities is crucial for maintaining optimal health and quality of life. One of the key steps in this process is undergoing a food sensitivity test. 

This article aims to provide you with a comprehensive step-by-step guide on how to prepare for a food sensitivity test.

Understanding Food Sensitivities

Definition of food sensitivities

Food sensitivities, also referred to as food intolerances, occur when the body struggles to digest or process specific foods or substances, leading to negative reactions. Unlike food allergies, which trigger immune system responses, food sensitivities primarily affect the digestive system.

Common symptoms

Joint pain and inflammation

Some common symptoms and health issues associated with food sensitivities include:

  • Digestive issues: bloating, gas, abdominal pain, diarrhea, constipation, and nausea.
  • Skin problems: eczema, hives, rashes, itching, and acne.
  • Headaches and migraines: recurring headaches or migraines after consuming trigger foods.
  • Fatigue and low energy: feelings of fatigue, sluggishness, and a general lack of energy.
  • Joint pain and inflammation: joint pain, swelling, and inflammation due to food sensitivities.
  • Mood and behavioral changes: irritability, anxiety, depression, and difficulty concentrating.
  • Respiratory issues: nasal congestion, sneezing, wheezing, or asthma.

Difference between food allergies and food sensitivities

It's important to differentiate between food allergies and food sensitivities, as they involve different mechanisms in the body:

  • Immune system involvement: Food allergies are immune responses triggered by specific proteins in foods. They involve the release of antibodies (IgE) and can cause severe and potentially life-threatening reactions, such as anaphylaxis. In contrast, food sensitivities primarily involve non-IgE immune responses or non-immune reactions.
  • Onset and severity of symptoms: Food allergies often elicit immediate and severe symptoms shortly after consuming the allergenic food. In contrast, food sensitivities may have delayed onset symptoms, appearing hours or even days after consuming the trigger food. The symptoms of food sensitivities are generally less severe than those of food allergies.
  • Testing methods: Food allergies can be diagnosed through skin prick tests or blood tests that detect IgE antibodies. In contrast, food sensitivities are more challenging to diagnose. While there are IgG-based blood tests available, they are controversial and not universally accepted. Elimination diets, in which suspected trigger foods are temporarily removed from the diet and then reintroduced, are often used to identify food sensitivities.

Understanding the distinctions between food allergies and food sensitivities is crucial for proper diagnosis and management. 

Types of Food Sensitivity Tests

Elimination diet

There are several types of food sensitivity tests that include:

IgE-based tests: 

These tests are commonly used to diagnose immediate allergic reactions, such as food allergies. They measure the levels of immunoglobulin E (IgE) antibodies in the blood or determine the skin's reaction to specific allergens. Skin prick tests involve placing small amounts of allergens on the skin and observing for an allergic reaction. Blood tests, such as the specific IgE test, measure the levels of IgE antibodies in response to specific food allergens.

IgG-based tests: 

IgG-based tests measure the levels of immunoglobulin G (IgG) antibodies in the blood in response to various food antigens. It is believed that elevated IgG levels may indicate sensitivity to certain foods. However, the scientific evidence supporting the use of IgG-based tests for diagnosing food sensitivities is limited, and these tests are considered controversial within the medical community.

Elimination diet: 

An elimination diet involves systematically removing potential trigger foods from the diet and then gradually reintroducing them to identify any adverse reactions. This method helps identify specific foods that may be causing symptoms. It requires careful planning and monitoring under the guidance of a healthcare professional or registered dietitian to ensure nutritional adequacy.

It's important to note that no single food sensitivity test is considered definitive, and their accuracy can vary. The choice of which test to use depends on factors such as the individual's symptoms, medical history, and the healthcare professional's recommendation. 

Consultation with a Healthcare Professional

Healthcare Professional

It is imperative to seek guidance from a qualified healthcare professional when preparing for a food sensitivity test. This is because healthcare professionals, such as allergists, immunologists, or functional medicine practitioners, have specialized training and expertise in diagnosing and managing food sensitivities. They possess in-depth knowledge of various testing methods, treatment options, and dietary adjustments to help you effectively manage your condition.

Consulting with a healthcare professional is crucial for accurate diagnosis. Food sensitivities can be complex and may present with overlapping symptoms. A healthcare professional can help differentiate between food sensitivities, food allergies, or other underlying health conditions. They can recommend the most suitable tests or procedures to obtain accurate and reliable results.

Moreover, a healthcare professional can provide an individualized approach. Each person's situation is unique, and a healthcare professional can tailor the diagnostic process and treatment plan to your specific needs. They consider your medical history, symptoms, lifestyle factors, and dietary preferences to create an individualized approach that maximizes the effectiveness of the food sensitivity test and subsequent management strategies.

Preparing for the Food Sensitivity Test

Preparing for a food sensitivity test involves several important steps to ensure accurate results and a smooth testing process. Here are key considerations when preparing for a food sensitivity test:

  • Reviewing dietary habits and keeping a food diary
  • Identifying potential trigger foods
  • Gathering necessary information
  • Following specific instructions from the healthcare professional
  • Preparing mentally for the potential outcomes of the test

By taking these preparatory steps, you can maximize the effectiveness of the food sensitivity test, facilitate accurate diagnosis, and pave the way for an appropriate management plan tailored to your specific needs. 

Elimination Diet

Here is an overview of the elimination diet process and the steps involved:

Choosing the foods to eliminate: 

Start by identifying common allergenic foods that are known to trigger sensitivities in some individuals. These can include dairy products, gluten-containing grains, eggs, soy, nuts, shellfish, and certain fruits or vegetables. Consultation with a healthcare professional or registered dietitian can help you determine which specific foods to eliminate based on your symptoms, medical history, and any previous dietary patterns you have observed.

Planning alternative meal options: 

Once you have identified the foods to eliminate, it is important to plan alternative meal options to ensure a nutritionally balanced diet during the elimination phase. Seek guidance from a healthcare professional or a qualified dietitian to help you create meal plans that meet your dietary needs while avoiding the trigger foods. This may involve exploring new recipes, incorporating a variety of nutrient-rich foods, and considering suitable substitutes for the eliminated foods.

Monitoring symptoms and food intake: 

Throughout the elimination diet, keep a close eye on your symptoms and track any changes or improvements. A food and symptom journal can be valuable for recording your daily food intake and any symptoms you experience. Note any physical or digestive symptoms, changes in energy levels, mood, or other relevant factors. This information will help you identify patterns and potential triggers once the reintroduction phase begins.

Reintroducing eliminated foods systematically: 

After a period of eliminating the trigger foods, the next step is to reintroduce them one at a time, in a controlled and systematic manner. Start with small portions of a single eliminated food and monitor your body's response over the following days. If no adverse reactions occur, gradually increase the amount of that food over the next few days. This process allows you to pinpoint specific trigger foods and assess your body's tolerance to them. It is essential to follow a structured reintroduction plan and consult with a healthcare professional or dietitian for guidance throughout this phase.

Keeping a food journal during the elimination diet process: 

A food journal is an invaluable tool during an elimination diet. Record the foods you consume, including ingredients and preparation methods, as well as any symptoms experienced. Be diligent in documenting the timing of symptoms and any other relevant details. This information will help you and your healthcare professional evaluate the effects of the elimination and reintroduction phases, identify trigger foods, and develop a long-term management plan.

Remember, the elimination diet should be conducted under the guidance of a healthcare professional or a registered dietitian to ensure safety, accurate interpretation of results, and proper nutritional support throughout the process.


It's important to understand that these tests have limitations and may not provide a clear-cut answer.

One of the limitations is the potential for false positives or false negatives. False positives can occur when the test identifies a sensitivity to a food that does not cause symptoms. False negatives can occur when the test fails to identify sensitivity to a food that is causing symptoms. Additionally, some people may have food sensitivities that are not detectable by current testing methods.

Interpreting the results in conjunction with symptoms is also important. It's possible to have a positive test for food sensitivity, but not experience any symptoms when consuming that food. On the other hand, someone may have negative test results for food sensitivity but still experience symptoms when consuming that food.

It's also important to understand that the elimination of a specific food from your diet may not completely alleviate symptoms, particularly if there are multiple factors contributing to the symptoms.

Therefore, it's important to work closely with a healthcare professional to understand the limitations of the test, interpret the results correctly, and develop a comprehensive management plan that addresses all potential factors contributing to symptoms. This may include dietary changes, medication adjustments, and lifestyle modifications.

Lifestyle Adjustments

Lifestyle Adjustments

Lifestyle adjustments play an important role in managing food sensitivities and promoting overall well-being. Here are some strategies to consider:

Strategies for reducing stress and promoting overall well-being: 

Stress can exacerbate symptoms related to food sensitivities. Implementing stress-reduction techniques can help improve your overall well-being. Consider incorporating activities such as mindfulness meditation, yoga, deep breathing exercises, regular physical exercise, and adequate sleep into your daily routine. These practices can help reduce stress levels and support a healthy immune system.

Seeking support from friends, family, or support groups: 

Dealing with food sensitivities can be challenging, both emotionally and socially. It can be helpful to seek support from friends, family members, or support groups who understand your situation and can provide empathy, encouragement, and practical advice. They can offer a listening ear, share experiences, and provide tips for managing social situations or finding suitable alternatives.

Exploring alternative diets and recipes: 

Adopting an alternative diet that avoids trigger foods can be an effective way to manage food sensitivities. For example, exploring gluten-free, dairy-free, or low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) diets may be beneficial for some individuals. Consult with a registered dietitian or healthcare professional to ensure you are meeting your nutritional needs while following these diets. Additionally, explore a variety of recipes and culinary resources that cater to your dietary restrictions, as this can help you maintain a diverse and enjoyable eating experience.

Remember, lifestyle adjustments should be personalized and based on your specific needs and preferences. Working closely with a healthcare professional, registered dietitian, or nutritionist can provide valuable guidance and support in making appropriate lifestyle adjustments that enhance your overall well-being while managing food sensitivities effectively.


In conclusion, preparing for a food sensitivity test is crucial for accurate diagnosis and effective management of food sensitivities. By reviewing dietary habits, identifying potential trigger foods, gathering necessary information, following specific instructions, and preparing mentally, individuals can ensure they are adequately prepared for the test. Implementing an elimination diet and keeping a food journal can also aid in identifying trigger foods. However, it is essential to manage expectations, understand the limitations of the test, and interpret results in conjunction with symptoms. Advanced Food Intolerance Lab (AFIL) test kits allow you to easily identify foods that your body is intolerant with minimal preparations. 

Additionally, lifestyle adjustments such as reducing stress, seeking support, and exploring alternative diets can further aid in managing food sensitivities. Taking proactive steps toward managing food sensitivities can lead to improved overall health and well-being. Remember to consult with a healthcare professional for guidance and personalized advice.

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  2. Kennedy, D. A., Lewis, E., Cooley, K., & Fritz, H. (2014). An exploratory comparative investigation of Food Allergy/Sensitivity Testing in IBS (The FAST Study): A comparison between various laboratory methods and an elimination diet. Advances in integrative medicine, 1(3), 124-130.
  3. Bahna, S. L. (1987). Food sensitivity: Handling reactions to foods and food additives. Postgraduate Medicine, 82(5), 195-209.
  4. GALANT, S. P., BULLOCK, J., & FRICK, O. L. (1973). An immunological approach to the diagnosis of food sensitivity. Clinical & Experimental Allergy, 3(4), 363-372.

Author: Dr. Sony S. | Panel Expert, Medical Doctor Dr. Sony is known for her medical articles, written with in-depth detail and accuracy owing to her vast medical knowledge and thorough research of each article. She completed her degree with multiple scholarships from Guangzhou Medical University and is a board-certified Clinical Doctor. She is currently working as a Medical Officer in the emergency department of a renowned hospital and continues to publish numerous medical papers and articles. Dr. Sony continues to lead the way in medical breakthroughs, unparalleled by her high level of detail, knowledge and passion for discovering new sciences and innovative healthcare treatments.

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