I knew this very thin, elegant, middle-aged couple. He was a college physical education professor. She taught English. We found ourselves in a cafeteria line one day. They commented, with a self-righteous edge, on the bad choices so many people make when they eat. The trays of these two were, of course, loaded with reasonable portions of low-fat, fresh, whole-grain food.
I responded by telling them the story of a good friend who'd always had the most perfect peaches and cream complexion. She just couldn't understand why everybody didn't follow simple rules of hygiene so their skin could look like hers. Then one day, in her late twenties, she developed a case of acne like what rest of us had had to struggle with as adolescents. My friend quickly stopped believing that people with imperfect complexions had gotten what they deserved.
Those professors didn't get the point of my story, though. They stuck to their belief that good eating was achievable by anybody willing to bring their reason and will to bear on their intake. Thank God this couple hadn't made a career out of counseling people with eating disorders.