Book excerpt: Most people try out diets just to see if they work. One friend cuts out sugar, a second cuts out fat. Another mumbles something about gut microbes. Even scientists still seem to be arguing about what causes obesity, so what hope is there for the rest of us? Anthony Warner, author of The Angry Chef, has decided to get to the bottom of it once and for all. Is obesity really an epidemic? Can you be addicted to food? Can’t you just exercise your way to freedom? And what the heck is a food desert? You want the truth? The science, without the prejudice? You can handle it.