Restaurants that are good for the environment but not necessarily good for your waistline have found success in recent years, as consumers place importance on big issues like sustainable beef, antibiotic-free meats and organic farming. Some of the biggest restaurants and grocers have gotten in on the game, including Wal-Mart, which offers organic fruits and vegetables, and McDonald's, which has made commitments to use more sustainable cattle farming practices and has taken steps to strip out hormones, antibiotics and preservatives from meat and bread. Other niche fast-food burger chains that focus on "clean food," like Shake Shack and Epic Burger, have seen success and expansion.