Americans have a drinking problem, and not the type you might think. As the authors of the best-selling book Eat This, Not That!, David Zinczenko and co-author Matt Goulding get e-mails all the time from readers who claim they eat carefully, they work out consistently, but they still can't get the needle on the scale to budge. "What gives?" goes the collective, exasperated refrain from the stagnant dieter.