I don't often consume fast food, but if I find myself in a pinch I will go to Chipotle. I feel as though they are more responsible with where they source their ingredients than other fast food places.
I always get the salad with chicken, black beans, guacamole, etc. I love their guacamole. I will eat it until I am sick b/c I just can't stop.
I went this evening and even at 9pm there was a line of 13 people. I do not think they were properly staffed for this. I got to the front of the line and they were out of vegetables. I had to wait another 5 minutes while the vegetables were cooked. There was a traffic jam at the cash register, which was backing everything else up. Needless to say, it wasn't qualified as "fast food" this evening.