"Groucho Marx quipped, `Who are you going to believe, me or your own eyes?' His wisdom comes to mind when self-evident truths are questioned by heretics bearing statistics. Jeffrey Friedman of Rockefeller University says today's thinking about obesity is, at best, "a hurtful myth" perpetuated by those who don't have either science or statistics on their side. ... While some data regarding the rate of American weight gain may indeed be debatable, the fact that more Americans are overweight than before is undeniable. You need only believe your own eyes."