Two weeks ago, a friend and I pulled into the drive-thru of a McDonald’s in Bennington, Vermont and indulged ourselves. We ordered a couple of value meals and a 10-piece nuggs for good measure. I estimated the meals to be around 1,400 calories each. We ate in near silence both staring through the windshield and off into the middle distance as if in a trance. As I finished off the remaining sweet and sour sauce, I resolved that I would put at least three months between this night and my next visit to the Golden Arches or indeed any other fast food establishment.