Allergized

• occur when you eat the food you can not tolerate,
• disappear or decrease when you stop eating the food, and
• come back when you eat the food again.

Hypersensitivity to food are divided into food allergies and non-allergic food hypersensitivity.

Food allergies

Food allergies occur, when specific proteins (allergens) in food affects the body’s immune system. The body may respond by forming allergy antibodyIgE. The antibody is directed at the food you are allergic to. In rare cases, IgE is not formed, but the allergy is triggered in a different way. Coeliac disease an example on this – although coeliac disease normally is not considered as an allergic disease.

When you eat the food you can not tolerate, there is an allergic reaction with symptoms from the eyes, nose, lungs, skin, stomach and intestinal canal or heart-cardio vascular system. Most common two or more symptoms are seen.

It is different how much of the allergen, is required to produce symptoms, but in some cases even very small quantities can trigger severe symptoms.

The allergy antibody is measured by an allergy test – either a blood sample or a test on the skin, known as a priktest. Other tests, such as lappetest on the skin, are used in rare cases to investigate for other allergic mechanisms.

The allergy test is not enough to make the final diagnosis. 

Non-allergic food hypersensitivity

In non-allergic food hypersensitivity there is no allergic reaction from the body. The response can not be measured by an allergy test.

Most often, the symptoms of the non-allergic food hypersensitivity is lighter and comes later than with food allergy, and often you must eat more of the food (the allergen) before experiencing symptoms. You can not however, from the symptoms alone distinguish between food allergy and non-allergic food hypersensitivity.

Hypersensitivity to food additives is usually a non-allergic food hypersensitivity like sensitivity to milk (xyz). Some of the diseases, which falls under the non-allergic food hypersensitivity, was formerly called intolerance. 

The diagnosis

A blood sample or a skin prick test can only be used to support a presumption of allergy, but is never enough to make the diagnosis of food hypersensitivity. This diagnosis can only be made final by comparing the medical history and test with a period of diet and a provocation. During the diet, you should not eat the suspected food. In the subsequent provocation, you must eat them again.

In both food and non-allergic food hypersensitivity symptoms will disappear or be reduced when dieting and return when provoked. 

Contact allergy and food

Contact allergy may occur when chemicals comes in contact with the skin. The contact allergy appears as eczema on the skin. Nickel allergy is an example of contact allergy.

If you have a contact allergy,  such as nickel allergy, you might experience in rare cases, that the skin symptoms will flare up if you eat food that contains nickel in sufficient quantities.

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