A food intolerance, also known as non-IgE-mediated food hypersensitivity or non-allergic food hypersensitivity, refers to difficulty digesting certain foods. It's important to note that food intolerance is different from food allergy. Food allergies trigger the immune system, whereas food intolerances do not. Some people experience digestive problems after eating certain foods even though their immune system hasn't reacted—there's no histamine reaction. The foods most commonly associated with food intolerances include dairy products, gluten-containing grains, and foods that cause intestinal gas, such as beans and cabbage. Food allergies and intolerances—whether genuine or lifestyle varieties—are on the rise, and various tests are available to help people identify problematic foods. Doctors can offer conventional skin prick tests for allergies, while a dietitian can supervise food intolerance testing. But sometimes these tests find nothing, and troubling symptoms persist. While some people are confused by true allergies, some are willing to go to great lengths to be "diagnosed" with allergies or food intolerances—and many are willing to take their money and tell them what they want to hear. Unfortunately, many of these popular tests offered by naturopaths and other natural health practitioners or over the internet lack credibility.
Common Food Allergies
According to the Australasian Society of Clinical Immunology and Allergy (ASCIA), there are nine foods that cause 90% of allergic reactions to food:
- Cow's milk
- Egg
- Peanut
- Tree nuts
- Sesame
- Soy
- Fish
- Shellfish
More than one in ten one-year-olds suffer from food allergies, although many outgrow them—about two percent of adults suffer from food allergies.
Common Food Intolerances
It is more difficult to measure the prevalence of food intolerances in the population because many people claim to have food intolerances but do not have them officially tested and diagnosed. Common food intolerances include: Lactose - A sugar found in milk that some people lack the enzyme needed to break down, leading to intestinal symptoms (bloating, pain, diarrhea). Amines - Chemicals that cause blood vessels to dilate, resulting in flushing, congestion, and migraines. Sources include fruits and vegetables, wine, chocolate, and cheese. Sulfites - Preservatives used in beverages and dried fruits that can cause wheezing and other respiratory symptoms. Salicylates - Aspirin-like compounds found in certain herbs, spices, fruits, and vegetables. Can cause a range of symptoms, including asthma-like symptoms, congestion, and headaches. Glutamates - Found in Camembert, Parmesan cheese, tomatoes, soy sauce, and mushrooms. Symptoms may include headaches, hives, and nasal congestion or a runny nose. FODMAPs - People diagnosed with irritable bowel syndrome (IBS) appear to have an intolerance to certain sugars called FODMAPs—fermentable oligo-, di-, and monosaccharides and polyols. A low-FODMAP diet has been shown to be successful in resolving symptoms in 50–86% of patients. A low-FODMAP diet typically significantly reduces the amount of grains, fruits and vegetables, dairy products, and legumes you eat. It should be followed under the supervision of a dietitian trained in administering the diet to avoid nutrient deficiencies. Gluten - One of the most controversial food intolerances is gluten. Also known as non-celiac gluten sensitivity, gluten intolerance is associated with intestinal symptoms such as bloating, diarrhea, and nausea, as well as fatigue and psychological symptoms such as depression and brain fog.
Gluten Intolerance
Many Australians who are not celiac or allergic to wheat have been buying gluten, which has been increasingly demonized in alternative health and food faddism circles over the past decade. They buy gluten-free versions of foods at least sometimes, and up to nine percent of Australians report being gluten intolerant. However, this figure is likely an overestimate of the true prevalence of gluten intolerance. It's not uncommon to experience fewer good symptoms when giving up gluten-containing foods, as people generally eat less, but this may not be due to the gluten. Because the symptoms of gluten intolerance overlap with those of IBS, it's quite possible that people who experience symptoms from eating bread, pasta, and other gluten-containing foods are actually reacting to FODMAPs in wheat rather than the gluten protein. Studies have shown that in some self-declared gluten-intolerant individuals, symptoms disappear after following a low-FODMAP diet, and no symptoms occur when exposed to gluten protein. While eating "gluten" in most cases also means eating FODMAPs, some gluten-free products may contain FODMAPs that should be avoided. And if FODMAPs are the problem, it's better to deal with all relevant foods, not just grains.
Testing
The key to managing food allergies and intolerances is an accurate diagnosis of the foods causing the problem. The type of testing you have depends on whether you have a suspected allergy or an intolerance.
Recommended Tests
Allergy Testing
The gold standard test for allergies is a skin prick test. This involves placing a drop of suspected allergen on the skin, which is then pricked with a lancet to allow the allergen extract to penetrate the skin. A reaction at the site, such as an itchy lump, likely indicates an allergy to that substance—whether it be food, pollen, cat dander, dust mites, bee stings, and so on. If a skin prick test cannot be performed—for example, if the patient has eczema, has taken antihistamines in the past week, or if a severe reaction is expected—another test is a specific immunoglobulin E (IgE) test, formerly known as the RadioAllergoSorbent Test (RAST). This test measures antibodies to specific allergens, requiring a separate test for each suspected allergen. Skin prick and specific IgE tests are covered by Medicare.
Celiac Disease Testing
Family history and blood tests may indicate the possibility of celiac disease. However, the diagnosis can only be confirmed through a small intestinal biopsy and assessment for damage.
Food Intolerance Testing
The gold standard for food intolerance testing is a temporary elimination diet followed by a controlled food challenge to identify dietary triggers. Under the supervision of a registered dietitian and a physician, foods suspected of causing symptoms are removed from the diet. Once symptoms have cleared, the foods are reintroduced to determine if symptoms recur.
Other Medical Tests
While some tests are scientifically plausible and useful in specific situations, they are not as reliable or informative as the recommended tests and are not recommended by us in general circumstances.
Breath Hydrogen Tests
Fructose and lactose malabsorption, which is often associated with intestinal symptoms such as bloating, gas, pain, and diarrhea in people with IBS, can be detected using breath hydrogen tests. It is based on the idea that hydrogen in the breath is produced by the fermentation of poorly absorbed carbohydrates. Following a special diet low in fermentable sugars, the patient receives a dose of sugar (fructose or lactose), and the hydrogen produced by malabsorption can be measured. While these tests are widely used, there have been problems with the reliability of the method and the interpretation of the results.
Total IgE Antibodies
While true allergy tests measure IgE antibodies directed against specific allergens, total IgE tests measure the total number of antibodies in a blood sample. An increase in IgE antibodies could be due to allergies, but also to parasitic infections and other conditions. On the other hand, people with allergies can have normal total IgE levels.
Eosinophil Testing
Eosinophils are a type of white blood cell that may be higher in people with allergies. However, as with total IgE, elevated levels may be due to another cause and occur at normal levels in people with allergies. Therefore, a test result showing a high eosinophil count is not necessarily helpful for an allergy diagnosis.
Unproven Tests
There are many other tests offered online or by health professionals such as naturopaths and chiropractors whose effectiveness has not been proven. The following tests have been criticized for various reasons, including lack of scientific plausibility, lack of correlation with medically accepted tests, and inconsistent results when repeated in the same person.
IgG Tests
One of the most common alternative allergy and food intolerance tests is an IgG test (not to be confused with IgE tests) from brands like ImuPro and Hemocode. These are often offered by naturopaths and other health practitioners, or you can make your own via mail-order. These claim to test for nearly 300 different foods with a single drop of blood, costing hundreds of dollars. The claim is that if you are allergic or intolerant to a particular food, you have certain antibodies that can be detected in the test, and this will also tell you the extent of your sensitivity. Experts say that while IgG plays a role in the allergic reaction, the tests don't reveal anything useful. The antibodies detected simply reflect what you've eaten—so exposure rather than intolerance. They also note that in people who suffer from allergies—which is especially true in children—the level of IgG antibodies increases. Tests have shown that people with known, genuine intolerances, as detected through elimination diets and oral exposure, do not show elevated IgG antibodies.
Cytotoxic and Alcat Tests
Cytotoxic tests are based on observing changes in white blood cells after exposure to potential allergens, while the antigen leukocyte cell antibody test (ALCAT) measures changes in the diameter of white blood cells after exposure to specific foods to determine intolerances.
Hair Analysis
Hair analysis claims to test for allergies or intolerances to up to 600 different food and non-food substances using technology "based on quantum physics and incorporating the principles of EAV, radionics, and homeopathy." It claims to measure the electromagnetic energy of the hair sample when it comes into contact with the substance. Some tests for heavy metals and mineral deficiencies claim that these are somehow related to allergies. There are no scientifically plausible means of detecting allergies or intolerances in hair, and there is no evidence to support them.
Vega Tests
Vega machines, or BioEnergetics tests, claim to detect allergies and food intolerances by measuring changes in the galvanic skin response. Other names include electrodermal, full, quantum, and dermatron tests—sometimes the machine names are used. An electrode is placed on your finger, and a sealed food container is introduced into the circuit. A reduced or "disordered" electrical current indicates an allergy or intolerance.
Bicom Testing
The Bicom is a bioresonance machine that records "specific frequency patterns" from a patient (or from substances that harm or distress the organism) via electrodes. It claims to be able to test for and treat allergies such as food allergies, hay fever, and skin rashes. The device has been the subject of several complaints in Australia and the UK. Although the company cannot provide evidence that it can detect or treat allergies and food intolerances, it continues to be promoted and used by natural practitioners and is listed as a medical device with the TGA.
Applied Kinesiology
Practiced by some chiropractors and other natural therapists, allergies and food intolerances can be diagnosed using the principles of applied kinesiology. The practice involves the patient holding a sealed container containing a test substance in one hand while the practitioner tests the muscle strength of the opposite arm.
Why is it important to get the right test?
We had a live blood test done on myself and my children years ago. We also went down the hair analysis route. I've tried every other alternative therapy, and it cost us a fortune and yielded no results. As the mother of a child with life-threatening multiple food allergies, I would say go to the experts at an allergy clinic. Get a skin prick test and a RAST test. This will tell you what the allergies are and how severe they are. At the allergy clinic, we were billed in bulk. It cost us less to fly to Sydney as a family and get tested than the previous alternative tests, which showed nothing. Aside from the fact that specialty foods or diets that are free of allergens can also be more expensive than regular foods, there are numerous repercussions when someone decides they have a food intolerance or allergy that isn't real, whether self-diagnosed or diagnosed with unproven or unorthodox tests. First, the absence of a true allergy can be life-threatening. This is most likely a problem for children, in whom allergies are more common than in adults. Furthermore, symptoms attributed to a food intolerance may be due to a more serious condition. If you are concerned about symptoms, consult a doctor. People who avoid certain foods may be at risk of nutrient deficiencies. It is recommended that people with true food intolerances consult a registered dietitian to ensure this does not occur. Meanwhile, avoiding a food due to unjustified concerns about an allergy can lead to a true allergy—there are many examples of this occurring in children.
Conclusions
The consequences of bogus testing extend beyond your wallet. If you come across an allergy or intolerance test online or offered by your naturopathic practitioner, you should research whether it is evidence-based or not.

































