Understanding Food Intolerances: What a Blood Test Really Reveals

Why we often feel tired, bloated, or unwell—and how an intolerance test can help

You seem to eat healthily and take care of yourself—and yet you often feel tired, bloated, or experience vague symptoms such as headaches, blemished skin, or concentration problems? These symptoms can have many causes. One that is often overlooked is so-called food intolerances. Unlike allergies, these are not acute, severe immune reactions, but rather chronic processes that can put a strain on your body over a longer period.

With a modern intolerance test based on a blood test, you can investigate what is affecting your body—and do so conveniently from home. In this article, you will learn how a blood test for intolerances works, what scientific foundations exist for it, and why an individually tailored nutrition plan can significantly improve your quality of life.

What exactly is a food intolerance?

Unlike a classic food allergy, in which the immune system reacts strongly to an allergen by producing IgE antibodies, food intolerances often develop gradually. They are frequently associated with the production of IgG antibodies against specific food components.

These IgG reactions are controversial among experts. Some specialists regard them as a normal part of the immune system, while others see them as an indication of overload or irritation caused by a food. The fact is that an increasing number of studies and personal reports show that many people affected experience a significant improvement in their symptoms after an appropriate blood test for intolerances and a targeted dietary change.

How does an IgG-based intolerance test work?

The mybody® intolerance test is based on a simple blood sample that you can easily collect at home. The sample is analyzed in a specialized laboratory. The test measures whether and in what quantity IgG antibodies against specific foods are present in the blood.

What makes it special: The test covers more than 280 commonly consumed foods—from grains, dairy products, fruit, vegetables, and nuts to spices. This creates a comprehensive picture of your personal tolerance.

👉 Learn more: mybody® Food Intolerances IgG Blood Test

What symptoms can be caused by an intolerance?

The range of symptoms is broad and not always clear-cut. These include:

Bloating, diarrhea, or a feeling of fullness
Headaches or migraines
Skin problems such as atopic dermatitis or acne
Tiredness and exhaustion
Joint pain
Concentration problems

Precisely because the symptoms are so nonspecific, it is difficult to attribute them to a particular food. A structured intolerance test can provide clarity.

Scientific controversy: What do studies say about IgG tests?

Opinions differ regarding the significance of IgG antibodies. Some professional organizations, such as the German Society for Allergology and Clinical Immunology (DGAKI), take a cautious view. Other studies, however, show that an elimination diet based on an IgG intolerance test has led to a significant improvement in quality of life for many patients—particularly those with chronic intestinal complaints or migraines.

It is important to note that the test does not replace a medical diagnosis but serves as a guide. Combined with professional nutrition counseling, however, it can provide valuable insights.

Adjust your diet individually—instead of giving things up indiscriminately

The goal is not complete avoidance, but a conscious reduction of foods that do not agree with your body. Ideally, by making targeted adjustments to your diet, you can relieve your digestive system, calm your immune system, and gain more energy and well-being in the long term.

mybody® supports you with a scientifically grounded test, a digital results report, and specific nutritional recommendations—if desired, also with follow-up support from nutrition experts.

👉 Learn more now: Blood intolerance test—conveniently carried out at home

Conclusion: Your health starts with your diet

An unbalanced approach to food can have a major impact on your well-being—often without you recognizing the connection. A scientifically grounded intolerance test using a blood sample can help you better understand your body and take targeted action.

Would you like to find your individual path to more energy and well-being? Then the at-home intolerance test is your first step.

Scientific references

Stapel, S.O. et al. (2008): Testing for IgG4 against foods is not recommended as a diagnostic tool: EAACI Task Force Report. Allergy, 63(7), 793–796.
👉 DOI: 10.1111/j.1398-9995.2008.01705.x
Dölle-Bierke, S. et al. (2021): Position paper by DGAKI and GPA on the use of IgG tests for food intolerances. DGAKI Position Paper
👉 www.dgaki.de
European Academy of Allergy and Clinical Immunology (EAACI) (2017): IgG antibodies in food intolerance—Position paper.
👉 www.eaaci.org
Niggemann, B. & Beyer, K. (2009): Diagnostic approach to suspected food allergy in children and adults. Journal of Allergy and Clinical Immunology, 124(6), S114–S118.
👉 DOI: 10.1016/j.jaci.2009.10.008
Matsuo, H. et al. (2015): Food-specific IgG antibodies in healthy and symptomatic individuals. Biochemical and Biophysical Research Communications, 458(3), 582–586.
👉 DOI: 10.1016/j.bbrc.2015.01.158
Turner, P.J. et al. (2021): Food allergy diagnosis and management. BMJ, 372:n251.
👉 DOI: 10.1136/bmj.n251
National Institute for Health and Care Excellence (NICE) (2011): Food allergy in children and young people.
👉 www.nice.org.uk