Five years from now, every McDonald's burger will come wrapped in paper that carries a health warning from the Surgeon General.

Ten years from now, children will no longer be allowed to purchase fast food unless accompanied by a parent or guardian.

Those predictions present, from the food industry's point of view at least, worst-case scenarios. But the debate over obesity will certainly prompt some interesting challenges for food and beverage companies as the national health establishment, consumer activist groups, and lawyers ...