Witty Wednesday-Why are people who read a lot of books called “bookworms?”

Why are people who read a lot of books called “bookworms?”

Bookworms infest books and feed on the paste in the bindings so they spend a lot of time immersed in a book.

People who enjoy reading also spend a lot of time immersed in a book. So, the comparison is made between those people and bookworms.