Why do allergies differ from person to person? Also why others got no allergies?
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An allergy happens when your body thinks that something is toxic when it is isn’t. The causes of allergies are often unclear, but it constitutes a mistake by the immune system that it remembers indefinitely (by producing antibodies). Different people’s immune systems make different mistakes. Some people’s immune systems make no mistakes (of this type), and they have no allergies.
Nearly every human is a unique mixture of genes of the parents, so every body can behave differently in many ways. Unfortunately, this also applies to undesirable or harmful traits.
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