This wildly popular organic start-up should make fast food chains nervous

Fast-food is getting healthier, fast - and legacy chains are getting left in the dust.

The likes of LYFE Kitchen, Freshii, and Sweetgreen have introduced the concept of healthy meals to the fast-food industry, leaving iconic chains struggling on how to compete.

Washington, DC-based salad chain Sweetgreen is one of the leaders of the growing farm-to-table fast-food movement.

With the company's marketing espousing sustainability, local suppliers, and healthy menu items, the chain has captured the imagination of health-conscious urbanites who are wary of what they eat.

And it seems the chain has captured the attention of investors as well, raking in $35 million in funding for this year's third quarter.

Three Georgetown grads started Sweetgreen in 2007, and it has exploded to 31 restaurants across the country with more on the way.

I've heard stories of the famous lines stretching outside at the New York City Sweetgreen locations, so I had to find out for myself if this chain deserves its organic cult status.