Earlier quoted context omitted.
After (a very brief) look this seems to me like another Atkins-style diet Taubes' book is not a diet book, it's a thick book on all the things that are wrong on modern research on nutrition. It explains why the problem is not fats (nor greens), but refined carbohydrates like sugar and white flour. Very worth your time, really.
American obsesity can correlated to eating too much salt, sugar and fat. Fast food makes it cheap and easy to get into a pattern where a significant portion of your daily intake is essentially a combination of sugar (soda, coffee, tea, etc), fat (burgers, fries, tacos, etc) and salt (flavoring, preservatives, etc.) If we went back to the diet before there was fast-food then we'd have a lot less obesity. People would…
I suspect that if we went back to the diet before there was fast-food, people would be eating more flavorful (a.k.a. fatty) meat than lean meat.