> the white blood cells of the city harass the invading parasites that are trying to damage the city's ability to function

My experience with food trucks (in San Francisco and Austin) is that the trucks actually improve the city's ability to function, by providing competition to restaurants and better food options to office workers.

Hell, in San Francisco the trucks are so good that they even have an event ("Off the Grid") where all the trucks come together with some live music and it's always packed http://offthegridsf.com/wp-content/themes/otg-2012/images/Of...