FOOD DETECTIVE

Difference between allergy and intolerance
Food allergy and food intolerance are both a type of food sensitivity. Food intolerance doesn't involve the immune system, which are referred to as non-immunologically mediated reactions and they are generally not life-threatening. Very often, people mistake food intolerance for food allergy. Food intolerance is much more common, and is the less serious of the two conditions. Just because the body responds badly to a particular food, it doesnt automatically mean an allergy.
Sometimes; another type of reaction to food called food intolerance occurs.
Originally food intolerance was suggested as an umbrella term to cover a wide range of physiologically mediated reactions to food. More recently it is used to describe intolerances that do not result in a true allergy, ie non-immunologically mediated reactions to food.
The symptoms of food intolerance may look and feel like those of a food allergy such as vomiting, stomach ache and diarrhea. However; the immune system is inactive and it does not cause these symptoms. For example some fruit juices and natural sugars can cause rashes and diarrhea, but these arent allergic reactions.

Food allergy
This is a specific reaction resulting from an abnormal immunological response to a food which can be severe and life-threatening. The symptoms may be of rapid onset but can also develop more slowly (e.g. coeliac disease).

Food intolerance
Such reaction may be due to a directly triggered histamine release, pharmacological effects, enzyme deficiencies, irritant and toxic effects. There may also be other factors whose influence is not yet fully understood. Due to their variable aetiology (meaning the cause of the condition), the effects are also diverse. They can be acute and severe but are more usually chronic and diffuse, and hence often difficult to diagnose. Unlike immunologically mediated reactions, relatively large amounts of a food may need to be ingested for adverse effects to occur.

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