Conceived in 2007 by three Georgetown University undergrads who saw a void of healthful options in their neighborhood, Sweetgreen is also known for its eco-friendly practices. It expanded to trendy urban neighborhoods in Boston, New York City, Los Angeles and Chicago this summer. Its expansion has been aided by investors (including Shake Shack founder Danny Meyer), who have raised at least $95 million for the chain in the last couple of years. These investments have also allowed Sweetgreen to improve its online ordering system and launch a mobile app, in which VIP users can earn perks such as free fitness classes and Uber rides.