system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can people be allergic to things like Fish or Apples raw but not allergic to their cooked counter parts or vice versa?
gpt
If you are allergic to something, your body overreacts when detecting certain chemicals. Chemicals such as proteins in food are denatured and change structure when cooked, so the body recognises it as a completely different substance.