WASHINGTON - Fast food, a mainstay of American eating for decades, may have reached a plateau in the United States as the maturing baby-boom generation looks for a more varied menu.

华盛顿——快餐，作为一种主食方式，美国吃了几十年，可能已经达到高原，在美国作为成熟的婴儿潮世代看来，更像一个不同的菜单。