From the book:
"It's as if we decided that Mardi Gras and Christmas are so much fun we ought to make them year-round ways of life. We started living large literally as well as figuratively. From the beginning to the end of the long boom, the size of the average new American house increased by half, even as the average family became smaller. During the two decades ending 2007, the average new American car got 29 percent heavier, 89 percent more powerful, and 2 percent less efficient. Meanwhile, the average American gained about a pound a year, so that an adult of a given age is now at least twenty pounds heavier than someone of the same age during the 1970s. Back in the late 1970s, 15 percent of Americans were obese; more than a third of us are now."