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About Food Intolerances & Food Allergies |
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Sometimes the immune system produces antibodies called immunoglobulin to specific foods. Depending on whether the immunoglobulins are IgG or IgE, they can cause either food intolerance or a food allergy. There are important differences in the two reactions.
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Food Intolerance (IgG) |
Food Allergy (IgE) |
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Slow onset: hours to days after eating
reactive food
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Rapid onset: minutes to hours after eating
reactive food
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Reactions are usually to foods eaten most
often |
Reactions are relatively rare |
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Chronic disease strongly associated with
food intolerance |
Is an acute reaction: usually quick and
dramatic |
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Can affect any tissue or organ in the body |
Usually affects airways, skin or intestine |
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Difficult to detect without testing |
Readily apparent after eating food allergen |
Why test for food intolerance?
- Food intolerance occurs with the foods you eat most often.
- Most people are unaware that they are eating foods that make them sick.
- IgG reactions are much more common than IgE reactions, affecting as many as 1/3 of the general population.
- IgG reactions that cause food intolerance take hours to days to develop; making them very difficult to uncover without testing.
- More than 100 diseases and conditions are associated with food intolerance.
- More than 2/3 of people with chronic health conditions have IgG reactions to food.
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