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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.
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.
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.
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