<p>An&nbsp;<b>allergy is cause...

An allergy is caused by the immune system fighting substances in the environment that it should see as harmless, known as allergens. These innocent substances become targets, leading to allergic reactions.

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The frequency of food allergy nowadays

The frequency of food allergy has increased over the past 30 years. It is thought that allergies and increased sensitivity to foods are probably environmental, and related to Western lifestyles. Factors may include pollution, dietary changes and less exposure to microbes, which change how our immune systems respond.

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Food Allergies

Food allergies happen when your body reacts in a mild or a severe manner after consuming a type of food that your body is supersensitive to.

Severe food allergies in which the body exhibits serious symptoms like slow pulse, blood pressure drop and wheezing/dizziness (anaphylaxis), are getting increasingly common, with a quarter of people having allergies experiencing them. Anaphylaxis cases are on the upswing across the world, just as food allergies become widespread. While the data is tricky, multiple sources point towards a 7 percent rise in food allergies worldwide as of 2018.

Why food allergies are on the rise

bbc.com

Allergic reactions

Allergies occur when the immune system reacts to environmental substances that are harmless to most people.

Common allergens are food, pollen, dust mites, animals, insect stings, or medicines.

What are allergies and why are we getting more of them?

theconversation.com

The immune system and microbial infection

Our bodies' immune system keeps a track record of every microbe that it has ever encountered and defeated in the memory cells (white blood cells - B- and T-lymphocytes).

Once a microbe enters the body again, it can be easily recognized and defeated before it multiplies and make you feel sick.

Immune system explained - Better Health Channel

betterhealth.vic.gov.au

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