I have a twice ate from a food cart. I didn't get sick and die or anything so maybe they're ok to eat from. I don't know if they are any cheaper to eat from compared to a regular restaurant.
20 some years ago in New York City I saw a pretzel vendor drop a pretzel on the ground in time square, pick it up, apply the five second rule and put it back on his car so no I would never eat off of a food cart
