Sept. 15 — You may have heard that America is fat. You may have heard that nearly two-thirds of us are overweight and 31 percent of us are obese. You may have even heard last week that the Department of Agriculture will soon decrease the number of calories a person should eat every day, an admission that there’s no point in designing diets for the healthy average American when the healthy average American no longer exists. WE MUST BE fat. After all, Katie Couric did a two-hour special on it on Friday night. And even Dr. Phil, who previously spent...