system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are peanuts and other nuts such a common allergen, compared to other foods?
gpt
Peanuts contain many proteins that are not found in the body. 

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Say you are allergic to every 1/10 proteins not found in the body. Let's say fish has 3 proteins not found in the body and peanuts have 6. 

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Then take a group of 100 people. You will find a lot more people are allergic to peanuts as there are more proteins not in the body compared to fish.