Much of the world today, and surely even more in the past includes insects as food source - either seasonal find or cultivated supply.
Interestingly of the term itself, Internet declares first use of the word to date to 1975 (while the practice goes back much earlier).
See also visual authoring team of Peter Menzel and Faith D'Aluzio 2010 Man Eats Bug, http://menzelphoto.com/books/meb.php