Meanwhile, Taco Bell's sales rebounded in the first three months of the year following a nearly yearlong slump stemming from a short-lived lawsuit that raised questions about its meat filling.
Taco Bell accounts for about 60 percent of U.S. profit for Louisville-based Yum Brands Inc., whose chains also include KFC and Pizza Hut.
In its first-quarter earnings this year, Yum said sales at Taco Bell stores open at least a year — an indicator of a restaurant chain's health — rose 6 percent. Yum executives predicted even more robust gains for the chain in the second quarter.
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