Welcome to McAllen, Texas, the most obese city the United States and also in the World. Here, nearly one in two people is obese and almost half of the remaining population is overweight. That means 3 out of every 4 people outside are at risk of serious health problems and early death. As I drive, I pass from one fast-food place after another, 10 in 2 minutes. This isn’t urban planning, this is a fast-food corridor. ...