As National Sandwich Month begins a study reveals the most popular sandwich amongst Americans. According to the study the "Monte Cristo" sandwich, composed of ham, chicken, and Swiss cheese is the favorite sandwich choice.

A Texas A&M University study also reveals that Americans eat more than 45 million sandwiches annually with an average U.S. citizen consuming about 200 sandwiches a year. The study also estimates that an average child will eat around 1,500 peanut butter-and-jelly sandwiches before graduating from high school.

According to Business Wire, the sandwich is 245 years old and began in 1762 when John Montagu, the 4th Earl of Sandwich, asked for meat to be served between slices of bread to avoid interrupting a poker game.