The 8 Most Popular Fast-Food Items

5. Arby's Roast Beef Sandwich

Featuring only two ingredients, roast beef and a sesame seed bun, Arby's claims that this is the sandwich that put roast beef on the map. Like hitting up Arby's for lunch? It might be ok once in a while, but make sure it doesn't turn into one of the unhealthy lunchtime mistakes you're making.