Restaurants offer a range of products, from quick meals at an inexpensive price to indulgent foods and beverages that represent a “fine dining experience” to everything in between. For years, the emphasis has been on convenience, flavor, and taste, with the healthfulness of menu offerings often taking a back seat. There have been exceptions: The Subway sandwich chain’s long-running advertising campaign featured Jared Fogle, who reportedly lost a significant amount of weight by eating certain Sub…