Just last month, I marked my 25th year as a professional journalist, which I guess means my journalistic career is old enough to rent a car, no questions asked. Work in the news for that long, and you’ll occasionally find yourself surprised by things you published in the past. Like, I had all but forgotten that I had written this Time magazine cover story in 2008: A couple things here. One, as the cover demonstrates, journalistic sensitivity was…less than ideal then, to say the least. And two, over a quarter-century occasionally covering obesity (both childhood and adult), that story...