Americans are gluttons. This we know. I have seen the Sunday night buffet at a barbecue joint in Wilson, N.C. I have watched contestants weigh in at 400 lbs.-plus on The Biggest Loser. What’s worse, we pretend we’re not. We gobble up books like Skinny Bitch, a vegan manifesto, and yet 85% of Americans scarf down the fried-meat sandwich …