The latest research by Technomic Inc. finds that the average American adult eats 3.4 sandwiches per week. The most popular variety of sandwich continues to be the hamburger, with 39% of consumers saying they eat a burger once a week or more often and another 44% saying they eat a burger once every 2-4 weeks. The second most popular sandwich is the deli sandwich. Here’s all the statistics for the popularity of the different types of sandwiches.