Beauty JunkiesBy: Alex Kuczynski A star writer for the New York Times Styles section captures the follies, frauds, and fanaticism that fuel the American pursuit of youth and beauty in a wickedly revealing excursion into the burgeoning business of cosmetic enhancement. Americans are aging faster and getting fatter than any other population on the planet. At the same time, our popular notions of perfect beauty have become so strict it seems even Barbie wouldnt have a