New York City is a bellwether and a barometer of change, things start there. In the city, the idea of food is changing, the old hot dog carts are giving way, being pushed aside by veggie and smoothie stands and fruit vendors, by falafel salads. Fruit and vegetables are everywhere, as are new “fresh” fast food franchises that sell healthy salads and protein shakes instead of hamburgers and pizza. The streets are filled with carrots and oranges and grapes.