How can you be allergic to protein?

Answer 1

It's impossible to be allergic to protein itself, although there are several forms of meat, nut, and fruit Allergies. (All those have protein, you see.) Protein is an essential dietary component, and your body requires it to live. If you are allergic to a certain protein, it is not the protein itself that causes it, but something else in the meat/nut/fruit/whatever.